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// File: contracts/uniswapv2/interfaces/IUniswapV2Pair.sol
pragma solidity >=0.5.0;
interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);
    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);
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// File: contracts/uniswapv2/interfaces/IUniswapV2Factory.sol
pragma solidity >=0.5.0;
interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);
    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function migrator() external view returns (address);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);
    function createPair(address tokenA, address tokenB) external returns (address pair);
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// File: contracts/uniswapv2/interfaces/IUniswapV2Factory.sol
pragma solidity >=0.5.0;
interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);
    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function migrator() external view returns (address);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);
    function createPair(address tokenA, address tokenB) external returns (address pair);
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{"Address.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Collection of functions related to the address 
    type\n */\nlibrary Address {\n    /**\n     * @dev Returns true if `account` is a contract.\n     *\n     * [IMPORTANT]\n     * ====\n     * It is 
    unsafe to assume that an address for which this function returns\n     * false is an externally-owned account (EOA) and not a contract.\n     *\n  
       * Among others, `isContract` will return false for the following\n     * types of addresses:\n     *\n     *  - an externally-owned account\n   
      *  - a contract in construction\n     *  - an address where a contract will be created\n     *  - an address where a contract lived, but was 
    destroyed\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies on 
    extcodesize, which returns 0 for contracts in\n        // construction, since the code is only stored at the end of the\n        // constructor 
    execution.\n\n        uint256 size;\n        assembly {\n            size := extcodesize(account)\n        }\n        return size \u003e 0;\n    
    }\n\n    /**\n     * @dev Replacement for Solidity\u0027s `transfer`: sends `amount` wei to\n     * `recipient`, forwarding all available gas and 
    reverting on errors.\n     *\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n     * of certain opcodes, possibly 
    making contracts go over the 2300 gas limit\n     * imposed by `transfer`, making them unable to receive funds via\n     * `transfer`. {sendValue} 
    removes this limitation.\n     *\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n     *\n   
      * IMPORTANT: because control is transferred to `recipient`, care must be\n     * taken to not create reentrancy vulnerabilities. Consider using\n 
        * {ReentrancyGuard} or the\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions
    -pattern[checks-effects-interactions pattern].\n     */\n    function sendValue(address payable recipient, uint256 amount) internal {\n        
    require(address(this).balance \u003e= amount, \"Address: insufficient balance\");\n\n        (bool success, ) = recipient.call{value: amount}(\"\"
    );\n        require(success, \"Address: unable to send value, recipient may have reverted\");\n    }\n\n    /**\n     * @dev Performs a Solidity 
    function call using a low level `call`. A\n     * plain `call` is an unsafe replacement for a function call: use this\n     * function instead.\n  
       *\n     * If `target` reverts with a revert reason, it is bubbled up by this\n     * function (like regular Solidity function calls).\n     *\n 
        * Returns the raw returned data. To convert to the expected return value,\n     * use https://solidity.readthedocs.io/en/latest/units-and
    -global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n     *\n     * Requirements:\n     *\n     * - 
    `target` must be a contract.\n     * - calling `target` with `data` must not revert.\n     *\n     * _Available since v3.1._\n     */\n    function 
    functionCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionCall(target, data, \"Address: low-level 
    call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n     * `errorMessage` 
    as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(\n        address 
    target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        return 
    functionCallWithValue(target, data, 0, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes
    -}[`functionCall`],\n     * but also transferring `value` wei to `target`.\n     *\n     * Requirements:\n     *\n     * - the calling contract 
    must have an ETH balance of at least `value`.\n     * - the called Solidity function must be `payable`.\n     *\n     * _Available since v3.1._\n  
       */\n    function functionCallWithValue(\n        address target,\n        bytes memory data,\n        uint256 value\n    ) internal returns 
    (bytes memory) {\n        return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n    }\n\n    /**\n    
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n     * with `errorMessage` as a fallback 
    revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(\n        address target
    ,\n        bytes memory data,\n        uint256 value,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        require
    (address(this).balance \u003e= value, \"Address: insufficient balance for call\");\n        require(isContract(target), \"Address: call to non
    -contract\");\n\n        (bool success, bytes memory returndata) = target.call{value: value}(data);\n        return verifyCallResult(success, 
    returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but 
    performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(address target, bytes memory data) 
    internal view returns (bytes memory) {\n        return functionStaticCall(target, data, \"Address: low-level static call failed\");\n    }\n\n    
    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a static call.\n     *\n     * 
    _Available since v3.3._\n     */\n    function functionStaticCall(\n        address target,\n        bytes memory data,\n        string memory 
    errorMessage\n    ) internal view returns (bytes memory) {\n        require(isContract(target), \"Address: static call to non-contract\");\n\n     
       (bool success, bytes memory returndata) = target.staticcall(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    
    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a delegate call.\n     *\n    
     * _Available since v3.4._\n     */\n    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n      
      return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address
    -functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n   
     function functionDelegateCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns 
    (bytes memory) {\n        require(isContract(target), \"Address: delegate call to non-contract\");\n\n        (bool success, bytes memory 
    returndata) = target.delegatecall(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Tool 
    to verifies that a low level call was successful, and revert if it wasn\u0027t, either by bubbling the\n     * revert reason using the provided one
    .\n     *\n     * _Available since v4.3._\n     */\n    function verifyCallResult(\n        bool success,\n        bytes memory returndata,\n      
      string memory errorMessage\n    ) internal pure returns (bytes memory) {\n        if (success) {\n            return returndata;\n        } else 
    {\n            // Look for revert reason and bubble it up if present\n            if (returndata.length \u003e 0) {\n                // The easiest 
    way to bubble the revert reason is using memory via assembly\n\n                assembly {\n                    let returndata_size := mload
    (returndata)\n                    revert(add(32, returndata), returndata_size)\n                }\n            } else {\n                revert
    (errorMessage);\n            }\n        }\n    }\n}\n"},"Barn.sol":{"content":"// SPDX-License-Identifier: MIT LICENSE\n\npragma solidity ^0.8.0
    ;\n\nimport \"./IERC721Receiver.sol\";\nimport \"./Pausable.sol\";\nimport \"./Woolf.sol\";\nimport \"./WOOL.sol\";\n\ncontract Barn is Ownable, 
    IERC721Receiver, Pausable {\n  \n  // maximum alpha score for a Wolf\n  uint8 public constant MAX_ALPHA = 8;\n\n  // struct to store a stake\u0027s 
    token, owner, and earning values\n  struct Stake {\n    uint16 tokenId;\n    uint80 value;\n    address owner;\n  }\n\n  event TokenStaked(address 
    owner, uint256 tokenId, uint256 value);\n  event SheepClaimed(uint256 tokenId, uint256 earned, bool unstaked);\n  event WolfClaimed(uint256 tokenId
    , uint256 earned, bool unstaked);\n\n  // reference to the Woolf NFT contract\n  Woolf woolf;\n  // reference to the $WOOL contract for minting 
    $WOOL earnings\n  WOOL wool;\n\n  // maps tokenId to stake\n  mapping(uint256 =\u003e Stake) public barn; \n  // maps alpha to all Wolf stakes with 
    that alpha\n  mapping(uint256 =\u003e Stake[]) public pack; \n  // tracks location of each Wolf in Pack\n  mapping(uint256 =\u003e uint256) public 
    packIndices; \n  // total alpha scores staked\n  uint256 public totalAlphaStaked = 0; \n  // any rewards distributed when no wolves are staked\n  
    uint256 public unaccountedRewards = 0; \n  // amount of $WOOL due for each alpha point staked\n  uint256 public woolPerAlpha = 0; \n\n  // sheep 
    earn 10000 $WOOL per day\n  uint256 public constant DAILY_WOOL_RATE = 10000 ether;\n  // sheep must have 2 days worth of $WOOL to unstake or else 
    it\u0027s too cold\n  uint256 public constant MINIMUM_TO_EXIT = 2 days;\n  // wolves take a 20% tax on all $WOOL claimed\n  uint256 public constant 
    WOOL_CLAIM_TAX_PERCENTAGE = 20;\n  // there will only ever be (roughly) 2.4 billion $WOOL earned through staking\n  uint256 public constant 
    MAXIMUM_GLOBAL_WOOL = 2400000000 ether;\n\n  // amount of $WOOL earned so far\n  uint256 public totalWoolEarned;\n  // number of Sheep staked in 
    the Barn\n  uint256 public totalSheepStaked;\n  // the last time $WOOL was claimed\n  uint256 public lastClaimTimestamp;\n\n  // emergency rescue 
    to allow unstaking without any checks but without $WOOL\n  bool public rescueEnabled = false;\n\n  /**\n   * @param _woolf reference to the Woolf 
    NFT contract\n   * @param _wool reference to the $WOOL token\n   */\n  constructor(address _woolf, address _wool) { \n    woolf = Woolf(_woolf);\n 
       wool = WOOL(_wool);\n  }\n\n  /** STAKING */\n\n  /**\n   * adds Sheep and Wolves to the Barn and Pack\n   * @param account the address of the 
    staker\n   * @param tokenIds the IDs of the Sheep and Wolves to stake\n   */\n  function addManyToBarnAndPack(address account, uint16[] calldata 
    tokenIds) external {\n    require(account == _msgSender() || _msgSender() == address(woolf), \"DONT GIVE YOUR TOKENS AWAY\");\n    for (uint i = 0; 
    i \u003c tokenIds.length; i++) {\n      if (_msgSender() != address(woolf)) { // dont do this step if its a mint + stake\n        require(woolf
    .ownerOf(tokenIds[i]) == _msgSender(), \"AINT YO TOKEN\");\n        woolf.transferFrom(_msgSender(), address(this), tokenIds[i]);\n      } else if 
    (tokenIds[i] == 0) {\n        continue; // there may be gaps in the array for stolen tokens\n      }\n\n      if (isSheep(tokenIds[i])) \n        
    _addSheepToBarn(account, tokenIds[i]);\n      else \n        _addWolfToPack(account, tokenIds[i]);\n    }\n  }\n\n  /**\n   * adds a single Sheep 
    to the Barn\n   * @param account the address of the staker\n   * @param tokenId the ID of the Sheep to add to the Barn\n   */\n  function 
    _addSheepToBarn(address account, uint256 tokenId) internal whenNotPaused _updateEarnings {\n    barn[tokenId] = Stake({\n      owner: account,\n   
       tokenId: uint16(tokenId),\n      value: uint80(block.timestamp)\n    });\n    totalSheepStaked += 1;\n    emit TokenStaked(account, tokenId, 
    block.timestamp);\n  }\n\n  /**\n   * adds a single Wolf to the Pack\n   * @param account the address of the staker\n   * @param tokenId the ID of 
    the Wolf to add to the Pack\n   */\n  function _addWolfToPack(address account, uint256 tokenId) internal {\n    uint256 alpha = _alphaForWolf
    (tokenId);\n    totalAlphaStaked += alpha; // Portion of earnings ranges from 8 to 5\n    packIndices[tokenId] = pack[alpha].length; // Store the 
    location of the wolf in the Pack\n    pack[alpha].push(Stake({\n      owner: account,\n      tokenId: uint16(tokenId),\n      value: uint80
    (woolPerAlpha)\n    })); // Add the wolf to the Pack\n    emit TokenStaked(account, tokenId, woolPerAlpha);\n  }\n\n  /** CLAIMING / UNSTAKING 
    */\n\n  /**\n   * realize $WOOL earnings and optionally unstake tokens from the Barn / Pack\n   * to unstake a Sheep it will require it has 2 days 
    worth of $WOOL unclaimed\n   * @param tokenIds the IDs of the tokens to claim earnings from\n   * @param unstake whether or not to unstake ALL of 
    the tokens listed in tokenIds\n   */\n  function claimManyFromBarnAndPack(uint16[] calldata tokenIds, bool unstake) external whenNotPaused 
    _updateEarnings {\n    uint256 owed = 0;\n    for (uint i = 0; i \u003c tokenIds.length; i++) {\n      if (isSheep(tokenIds[i]))\n        owed += 
    _claimSheepFromBarn(tokenIds[i], unstake);\n      else\n        owed += _claimWolfFromPack(tokenIds[i], unstake);\n    }\n    if (owed == 0) return
    ;\n    wool.mint(_msgSender(), owed);\n  }\n\n  /**\n   * realize $WOOL earnings for a single Sheep and optionally unstake it\n   * if not 
    unstaking, pay a 20% tax to the staked Wolves\n   * if unstaking, there is a 50% chance all $WOOL is stolen\n   * @param tokenId the ID of the 
    Sheep to claim earnings from\n   * @param unstake whether or not to unstake the Sheep\n   * @return owed - the amount of $WOOL earned\n   */\n  
    function _claimSheepFromBarn(uint256 tokenId, bool unstake) internal returns (uint256 owed) {\n    Stake memory stake = barn[tokenId];\n    require
    (stake.owner == _msgSender(), \"SWIPER, NO SWIPING\");\n    require(!(unstake \u0026\u0026 block.timestamp - stake.value \u003c MINIMUM_TO_EXIT), 
    \"GONNA BE COLD WITHOUT TWO DAY\u0027S WOOL\");\n    if (totalWoolEarned \u003c MAXIMUM_GLOBAL_WOOL) {\n      owed = (block.timestamp - stake.value
    ) * DAILY_WOOL_RATE / 1 days;\n    } else if (stake.value \u003e lastClaimTimestamp) {\n      owed = 0; // $WOOL production stopped already\n    } 
    else {\n      owed = (lastClaimTimestamp - stake.value) * DAILY_WOOL_RATE / 1 days; // stop earning additional $WOOL if it\u0027s all been earned\n 
       }\n    if (unstake) {\n      if (random(tokenId) \u0026 1 == 1) { // 50% chance of all $WOOL stolen\n        _payWolfTax(owed);\n        owed = 
    0;\n      }\n      woolf.safeTransferFrom(address(this), _msgSender(), tokenId, \"\"); // send back Sheep\n      delete barn[tokenId];\n      
    totalSheepStaked -= 1;\n    } else {\n      _payWolfTax(owed * WOOL_CLAIM_TAX_PERCENTAGE / 100); // percentage tax to staked wolves\n      owed = 
    owed * (100 - WOOL_CLAIM_TAX_PERCENTAGE) / 100; // remainder goes to Sheep owner\n      barn[tokenId] = Stake({\n        owner: _msgSender(),\n    
        tokenId: uint16(tokenId),\n        value: uint80(block.timestamp)\n      }); // reset stake\n    }\n    emit SheepClaimed(tokenId, owed, 
    unstake);\n  }\n\n  /**\n   * realize $WOOL earnings for a single Wolf and optionally unstake it\n   * Wolves earn $WOOL proportional to their 
    Alpha rank\n   * @param tokenId the ID of the Wolf to claim earnings from\n   * @param unstake whether or not to unstake the Wolf\n   * @return 
    owed - the amount of $WOOL earned\n   */\n  function _claimWolfFromPack(uint256 tokenId, bool unstake) internal returns (uint256 owed) {\n    
    require(woolf.ownerOf(tokenId) == address(this), \"AINT A PART OF THE PACK\");\n    uint256 alpha = _alphaForWolf(tokenId);\n    Stake memory stake 
    = pack[alpha][packIndices[tokenId]];\n    require(stake.owner == _msgSender(), \"SWIPER, NO SWIPING\");\n    owed = (alpha) * (woolPerAlpha - stake
    .value); // Calculate portion of tokens based on Alpha\n    if (unstake) {\n      totalAlphaStaked -= alpha; // Remove Alpha from total staked\n   
       woolf.safeTransferFrom(address(this), _msgSender(), tokenId, \"\"); // Send back Wolf\n      Stake memory lastStake = pack[alpha][pack[alpha]
    .length - 1];\n      pack[alpha][packIndices[tokenId]] = lastStake; // Shuffle last Wolf to current position\n      packIndices[lastStake.tokenId] 
    = packIndices[tokenId];\n      pack[alpha].pop(); // Remove duplicate\n      delete packIndices[tokenId]; // Delete old mapping\n    } else {\n    
      pack[alpha][packIndices[tokenId]] = Stake({\n        owner: _msgSender(),\n        tokenId: uint16(tokenId),\n        value: uint80(woolPerAlpha
    )\n      }); // reset stake\n    }\n    emit WolfClaimed(tokenId, owed, unstake);\n  }\n\n  /**\n   * emergency unstake tokens\n   * @param 
    tokenIds the IDs of the tokens to claim earnings from\n   */\n  function rescue(uint256[] calldata tokenIds) external {\n    require(rescueEnabled, 
    \"RESCUE DISABLED\");\n    uint256 tokenId;\n    Stake memory stake;\n    Stake memory lastStake;\n    uint256 alpha;\n    for (uint i = 0; i 
    \u003c tokenIds.length; i++) {\n      tokenId = tokenIds[i];\n      if (isSheep(tokenId)) {\n        stake = barn[tokenId];\n        require(stake
    .owner == _msgSender(), \"SWIPER, NO SWIPING\");\n        woolf.safeTransferFrom(address(this), _msgSender(), tokenId, \"\"); // send back Sheep\n 
           delete barn[tokenId];\n        totalSheepStaked -= 1;\n        emit SheepClaimed(tokenId, 0, true);\n      } else {\n        alpha = 
    _alphaForWolf(tokenId);\n        stake = pack[alpha][packIndices[tokenId]];\n        require(stake.owner == _msgSender(), \"SWIPER, NO SWIPING\"
    );\n        totalAlphaStaked -= alpha; // Remove Alpha from total staked\n        woolf.safeTransferFrom(address(this), _msgSender(), tokenId, \"\"
    ); // Send back Wolf\n        lastStake = pack[alpha][pack[alpha].length - 1];\n        pack[alpha][packIndices[tokenId]] = lastStake; // Shuffle 
    last Wolf to current position\n        packIndices[lastStake.tokenId] = packIndices[tokenId];\n        pack[alpha].pop(); // Remove duplicate\n    
        delete packIndices[tokenId]; // Delete old mapping\n        emit WolfClaimed(tokenId, 0, true);\n      }\n    }\n  }\n\n  /** ACCOUNTING */\n\n 
     /** \n   * add $WOOL to claimable pot for the Pack\n   * @param amount $WOOL to add to the pot\n   */\n  function _payWolfTax(uint256 amount) 
    internal {\n    if (totalAlphaStaked == 0) { // if there\u0027s no staked wolves\n      unaccountedRewards += amount; // keep track of $WOOL due to 
    wolves\n      return;\n    }\n    // makes sure to include any unaccounted $WOOL \n    woolPerAlpha += (amount + unaccountedRewards) / 
    totalAlphaStaked;\n    unaccountedRewards = 0;\n  }\n\n  /**\n   * tracks $WOOL earnings to ensure it stops once 2.4 billion is eclipsed\n   */\n  
    modifier _updateEarnings() {\n    if (totalWoolEarned \u003c MAXIMUM_GLOBAL_WOOL) {\n      totalWoolEarned += \n        (block.timestamp - 
    lastClaimTimestamp)\n        * totalSheepStaked\n        * DAILY_WOOL_RATE / 1 days; \n      lastClaimTimestamp = block.timestamp;\n    }\n    _;\n 
     }\n\n  /** ADMIN */\n\n  /**\n   * allows owner to enable \"rescue mode\"\n   * simplifies accounting, prioritizes tokens out in emergency\n   
    */\n  function setRescueEnabled(bool _enabled) external onlyOwner {\n    rescueEnabled = _enabled;\n  }\n\n  /**\n   * enables owner to pause / 
    unpause minting\n   */\n  function setPaused(bool _paused) external onlyOwner {\n    if (_paused) _pause();\n    else _unpause();\n  }\n\n  /** 
    READ ONLY */\n\n  /**\n   * checks if a token is a Sheep\n   * @param tokenId the ID of the token to check\n   * @return sheep - whether or not a 
    token is a Sheep\n   */\n  function isSheep(uint256 tokenId) public view returns (bool sheep) {\n    (sheep, , , , , , , , , ) = woolf.tokenTraits
    (tokenId);\n  }\n\n  /**\n   * gets the alpha score for a Wolf\n   * @param tokenId the ID of the Wolf to get the alpha score for\n   * @return the 
    alpha score of the Wolf (5-8)\n   */\n  function _alphaForWolf(uint256 tokenId) internal view returns (uint8) {\n    ( , , , , , , , , , uint8 
    alphaIndex) = woolf.tokenTraits(tokenId);\n    return MAX_ALPHA - alphaIndex; // alpha index is 0-3\n  }\n\n  /**\n   * chooses a random Wolf thief 
    when a newly minted token is stolen\n   * @param seed a random value to choose a Wolf from\n   * @return the owner of the randomly selected Wolf 
    thief\n   */\n  function randomWolfOwner(uint256 seed) external view returns (address) {\n    if (totalAlphaStaked == 0) return address(0x0);\n    
    uint256 bucket = (seed \u0026 0xFFFFFFFF) % totalAlphaStaked; // choose a value from 0 to total alpha staked\n    uint256 cumulative;\n    seed 
    \u003e\u003e= 32;\n    // loop through each bucket of Wolves with the same alpha score\n    for (uint i = MAX_ALPHA - 3; i \u003c= MAX_ALPHA; i++) 
    {\n      cumulative += pack[i].length * i;\n      // if the value is not inside of that bucket, keep going\n      if (bucket \u003e= cumulative) 
    continue;\n      // get the address of a random Wolf with that alpha score\n      return pack[i][seed % pack[i].length].owner;\n    }\n    return 
    address(0x0);\n  }\n\n  /**\n   * generates a pseudorandom number\n   * @param seed a value ensure different outcomes for different sources in the 
    same block\n   * @return a pseudorandom value\n   */\n  function random(uint256 seed) internal view returns (uint256) {\n    return uint256
    (keccak256(abi.encodePacked(\n      tx.origin,\n      blockhash(block.number - 1),\n      block.timestamp,\n      seed\n    )));\n  }\n\n  function 
    onERC721Received(\n        address,\n        address from,\n        uint256,\n        bytes calldata\n    ) external pure override returns (bytes4) 
    {\n      require(from == address(0x0), \"Cannot send tokens to Barn directly\");\n      return IERC721Receiver.onERC721Received.selector;\n    
    }\n\n  \n}"},"Context.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Provides information about the 
    current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg
    .data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for 
    execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, 
    library-like contracts.\n */\nabstract contract Context {\n    function _msgSender() internal view virtual returns (address) {\n        return msg
    .sender;\n    }\n\n    function _msgData() internal view virtual returns (bytes calldata) {\n        return msg.data;\n    }\n}\n"},"ERC165.sol"
    :{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"./IERC165.sol\";\n\n/**\n * @dev Implementation of the 
    {IERC165} interface.\n *\n * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check\n 
    * for the additional interface id that will be supported. For example:\n *\n * ```solidity\n * function supportsInterface(bytes4 interfaceId) 
    public view virtual override returns (bool) {\n *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId
    );\n * }\n * ```\n *\n * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.\n */\nabstract contract ERC165 
    is IERC165 {\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view 
    virtual override returns (bool) {\n        return interfaceId == type(IERC165).interfaceId;\n    }\n}\n"},"ERC20.sol":{"content":"// SPDX-License
    -Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"./IERC20.sol\";\nimport \"./IERC20Metadata.sol\";\nimport \"./Context.sol\";\n\n/**\n * 
    @dev Implementation of the {IERC20} interface.\n *\n * This implementation is agnostic to the way tokens are created. This means\n * that a supply 
    mechanism has to be added in a derived contract using {_mint}.\n * For a generic mechanism see {ERC20PresetMinterPauser}.\n *\n * TIP: For a 
    detailed writeup see our guide\n * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How\n * to implement supply 
    mechanisms].\n *\n * We have followed general OpenZeppelin Contracts guidelines: functions revert\n * instead returning `false` on failure. This 
    behavior is nonetheless\n * conventional and does not conflict with the expectations of ERC20\n * applications.\n *\n * Additionally, an {Approval} 
    event is emitted on calls to {transferFrom}.\n * This allows applications to reconstruct the allowance for all accounts just\n * by listening to 
    said events. Other implementations of the EIP may not emit\n * these events, as it isn\u0027t required by the specification.\n *\n * Finally, the 
    non-standard {decreaseAllowance} and {increaseAllowance}\n * functions have been added to mitigate the well-known issues around setting\n * 
    allowances. See {IERC20-approve}.\n */\ncontract ERC20 is Context, IERC20, IERC20Metadata {\n    mapping(address =\u003e uint256) private _balances
    ;\n\n    mapping(address =\u003e mapping(address =\u003e uint256)) private _allowances;\n\n    uint256 private _totalSupply;\n\n    string private 
    _name;\n    string private _symbol;\n\n    /**\n     * @dev Sets the values for {name} and {symbol}.\n     *\n     * The default value of 
    {decimals} is 18. To select a different value for\n     * {decimals} you should overload it.\n     *\n     * All two of these values are immutable: 
    they can only be set once during\n     * construction.\n     */\n    constructor(string memory name_, string memory symbol_) {\n        _name = 
    name_;\n        _symbol = symbol_;\n    }\n\n    /**\n     * @dev Returns the name of the token.\n     */\n    function name() public view virtual 
    override returns (string memory) {\n        return _name;\n    }\n\n    /**\n     * @dev Returns the symbol of the token, usually a shorter version 
    of the\n     * name.\n     */\n    function symbol() public view virtual override returns (string memory) {\n        return _symbol;\n    }\n\n    
    /**\n     * @dev Returns the number of decimals used to get its user representation.\n     * For example, if `decimals` equals `2`, a balance of 
    `505` tokens should\n     * be displayed to a user as `5.05` (`505 / 10 ** 2`).\n     *\n     * Tokens usually opt for a value of 18, imitating the 
    relationship between\n     * Ether and Wei. This is the value {ERC20} uses, unless this function is\n     * overridden;\n     *\n     * NOTE: This 
    information is only used for _display_ purposes: it in\n     * no way affects any of the arithmetic of the contract, including\n     * {IERC20
    -balanceOf} and {IERC20-transfer}.\n     */\n    function decimals() public view virtual override returns (uint8) {\n        return 18;\n    }\n\n 
       /**\n     * @dev See {IERC20-totalSupply}.\n     */\n    function totalSupply() public view virtual override returns (uint256) {\n        return 
    _totalSupply;\n    }\n\n    /**\n     * @dev See {IERC20-balanceOf}.\n     */\n    function balanceOf(address account) public view virtual override 
    returns (uint256) {\n        return _balances[account];\n    }\n\n    /**\n     * @dev See {IERC20-transfer}.\n     *\n     * Requirements:\n     
    *\n     * - `recipient` cannot be the zero address.\n     * - the caller must have a balance of at least `amount`.\n     */\n    function transfer
    (address recipient, uint256 amount) public virtual override returns (bool) {\n        _transfer(_msgSender(), recipient, amount);\n        return 
    true;\n    }\n\n    /**\n     * @dev See {IERC20-allowance}.\n     */\n    function allowance(address owner, address spender) public view virtual 
    override returns (uint256) {\n        return _allowances[owner][spender];\n    }\n\n    /**\n     * @dev See {IERC20-approve}.\n     *\n     * 
    Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     */\n    function approve(address spender, uint256 amount) public 
    virtual override returns (bool) {\n        _approve(_msgSender(), spender, amount);\n        return true;\n    }\n\n    /**\n     * @dev See 
    {IERC20-transferFrom}.\n     *\n     * Emits an {Approval} event indicating the updated allowance. This is not\n     * required by the EIP. See the 
    note at the beginning of {ERC20}.\n     *\n     * Requirements:\n     *\n     * - `sender` and `recipient` cannot be the zero address.\n     * - 
    `sender` must have a balance of at least `amount`.\n     * - the caller must have allowance for ``sender``\u0027s tokens of at least\n     * 
    `amount`.\n     */\n    function transferFrom(\n        address sender,\n        address recipient,\n        uint256 amount\n    ) public virtual 
    override returns (bool) {\n        _transfer(sender, recipient, amount);\n\n        uint256 currentAllowance = _allowances[sender][_msgSender()];\n 
           require(currentAllowance \u003e= amount, \"ERC20: transfer amount exceeds allowance\");\n        unchecked {\n            _approve(sender, 
    _msgSender(), currentAllowance - amount);\n        }\n\n        return true;\n    }\n\n    /**\n     * @dev Atomically increases the allowance 
    granted to `spender` by the caller.\n     *\n     * This is an alternative to {approve} that can be used as a mitigation for\n     * problems 
    described in {IERC20-approve}.\n     *\n     * Emits an {Approval} event indicating the updated allowance.\n     *\n     * Requirements:\n     *\n 
        * - `spender` cannot be the zero address.\n     */\n    function increaseAllowance(address spender, uint256 addedValue) public virtual returns 
    (bool) {\n        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);\n        return true;\n    }\n\n    /**\n     * 
    @dev Atomically decreases the allowance granted to `spender` by the caller.\n     *\n     * This is an alternative to {approve} that can be used as 
    a mitigation for\n     * problems described in {IERC20-approve}.\n     *\n     * Emits an {Approval} event indicating the updated allowance.\n     
    *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     * - `spender` must have allowance for the caller of at 
    least\n     * `subtractedValue`.\n     */\n    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) 
    {\n        uint256 currentAllowance = _allowances[_msgSender()][spender];\n        require(currentAllowance \u003e= subtractedValue, \"ERC20: 
    decreased allowance below zero\");\n        unchecked {\n            _approve(_msgSender(), spender, currentAllowance - subtractedValue);\n        
    }\n\n        return true;\n    }\n\n    /**\n     * @dev Moves `amount` of tokens from `sender` to `recipient`.\n     *\n     * This internal 
    function is equivalent to {transfer}, and can be used to\n     * e.g. implement automatic token fees, slashing mechanisms, etc.\n     *\n     * 
    Emits a {Transfer} event.\n     *\n     * Requirements:\n     *\n     * - `sender` cannot be the zero address.\n     * - `recipient` cannot be the 
    zero address.\n     * - `sender` must have a balance of at least `amount`.\n     */\n    function _transfer(\n        address sender,\n        
    address recipient,\n        uint256 amount\n    ) internal virtual {\n        require(sender != address(0), \"ERC20: transfer from the zero 
    address\");\n        require(recipient != address(0), \"ERC20: transfer to the zero address\");\n\n        _beforeTokenTransfer(sender, recipient, 
    amount);\n\n        uint256 senderBalance = _balances[sender];\n        require(senderBalance \u003e= amount, \"ERC20: transfer amount exceeds 
    balance\");\n        unchecked {\n            _balances[sender] = senderBalance - amount;\n        }\n        _balances[recipient] += amount;\n\n  
          emit Transfer(sender, recipient, amount);\n\n        _afterTokenTransfer(sender, recipient, amount);\n    }\n\n    /** @dev Creates `amount` 
    tokens and assigns them to `account`, increasing\n     * the total supply.\n     *\n     * Emits a {Transfer} event with `from` set to the zero 
    address.\n     *\n     * Requirements:\n     *\n     * - `account` cannot be the zero address.\n     */\n    function _mint(address account, 
    uint256 amount) internal virtual {\n        require(account != address(0), \"ERC20: mint to the zero address\");\n\n        _beforeTokenTransfer
    (address(0), account, amount);\n\n        _totalSupply += amount;\n        _balances[account] += amount;\n        emit Transfer(address(0), account
    , amount);\n\n        _afterTokenTransfer(address(0), account, amount);\n    }\n\n    /**\n     * @dev Destroys `amount` tokens from `account`, 
    reducing the\n     * total supply.\n     *\n     * Emits a {Transfer} event with `to` set to the zero address.\n     *\n     * Requirements:\n     
    *\n     * - `account` cannot be the zero address.\n     * - `account` must have at least `amount` tokens.\n     */\n    function _burn(address 
    account, uint256 amount) internal virtual {\n        require(account != address(0), \"ERC20: burn from the zero address\");\n\n        
    _beforeTokenTransfer(account, address(0), amount);\n\n        uint256 accountBalance = _balances[account];\n        require(accountBalance \u003e= 
    amount, \"ERC20: burn amount exceeds balance\");\n        unchecked {\n            _balances[account] = accountBalance - amount;\n        }\n      
      _totalSupply -= amount;\n\n        emit Transfer(account, address(0), amount);\n\n        _afterTokenTransfer(account, address(0), amount);\n    
    }\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\n     *\n     * This internal function is 
    equivalent to `approve`, and can be used to\n     * e.g. set automatic allowances for certain subsystems, etc.\n     *\n     * Emits an {Approval} 
    event.\n     *\n     * Requirements:\n     *\n     * - `owner` cannot be the zero address.\n     * - `spender` cannot be the zero address.\n     
    */\n    function _approve(\n        address owner,\n        address spender,\n        uint256 amount\n    ) internal virtual {\n        require
    (owner != address(0), \"ERC20: approve from the zero address\");\n        require(spender != address(0), \"ERC20: approve to the zero address\"
    );\n\n        _allowances[owner][spender] = amount;\n        emit Approval(owner, spender, amount);\n    }\n\n    /**\n     * @dev Hook that is 
    called before any transfer of tokens. This includes\n     * minting and burning.\n     *\n     * Calling conditions:\n     *\n     * - when `from` 
    and `to` are both non-zero, `amount` of ``from``\u0027s tokens\n     * will be transferred to `to`.\n     * - when `from` is zero, `amount` tokens 
    will be minted for `to`.\n     * - when `to` is zero, `amount` of ``from``\u0027s tokens will be burned.\n     * - `from` and `to` are never both 
    zero.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function 
    _beforeTokenTransfer(\n        address from,\n        address to,\n        uint256 amount\n    ) internal virtual {}\n\n    /**\n     * @dev Hook 
    that is called after any transfer of tokens. This includes\n     * minting and burning.\n     *\n     * Calling conditions:\n     *\n     * - when 
    `from` and `to` are both non-zero, `amount` of ``from``\u0027s tokens\n     * has been transferred to `to`.\n     * - when `from` is zero, `amount` 
    tokens have been minted for `to`.\n     * - when `to` is zero, `amount` of ``from``\u0027s tokens have been burned.\n     * - `from` and `to` are 
    never both zero.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    
    function _afterTokenTransfer(\n        address from,\n        address to,\n        uint256 amount\n    ) internal virtual {}\n}\n"},"ERC721.sol"
    :{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"./IERC721.sol\";\nimport \"./IERC721Receiver.sol\";\nimport \"
    ./IERC721Metadata.sol\";\nimport \"./Address.sol\";\nimport \"./Context.sol\";\nimport \"./Strings.sol\";\nimport \"./ERC165.sol\";\n\n/**\n * @dev 
    Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including\n * the Metadata extension, but not 
    including the Enumerable extension, which is available separately as\n * {ERC721Enumerable}.\n */\ncontract ERC721 is Context, ERC165, IERC721, 
    IERC721Metadata {\n    using Address for address;\n    using Strings for uint256;\n\n    // Token name\n    string private _name;\n\n    // Token 
    symbol\n    string private _symbol;\n\n    // Mapping from token ID to owner address\n    mapping(uint256 =\u003e address) private _owners;\n\n    
    // Mapping owner address to token count\n    mapping(address =\u003e uint256) private _balances;\n\n    // Mapping from token ID to approved 
    address\n    mapping(uint256 =\u003e address) private _tokenApprovals;\n\n    // Mapping from owner to operator approvals\n    mapping(address 
    =\u003e mapping(address =\u003e bool)) private _operatorApprovals;\n\n    /**\n     * @dev Initializes the contract by setting a `name` and a 
    `symbol` to the token collection.\n     */\n    constructor(string memory name_, string memory symbol_) {\n        _name = name_;\n        _symbol 
    = symbol_;\n    }\n\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view 
    virtual override(ERC165, IERC165) returns (bool) {\n        return\n            interfaceId == type(IERC721).interfaceId ||\n            
    interfaceId == type(IERC721Metadata).interfaceId ||\n            super.supportsInterface(interfaceId);\n    }\n\n    /**\n     * @dev See {IERC721
    -balanceOf}.\n     */\n    function balanceOf(address owner) public view virtual override returns (uint256) {\n        require(owner != address(0), 
    \"ERC721: balance query for the zero address\");\n        return _balances[owner];\n    }\n\n    /**\n     * @dev See {IERC721-ownerOf}.\n     */\n 
       function ownerOf(uint256 tokenId) public view virtual override returns (address) {\n        address owner = _owners[tokenId];\n        require
    (owner != address(0), \"ERC721: owner query for nonexistent token\");\n        return owner;\n    }\n\n    /**\n     * @dev See {IERC721Metadata
    -name}.\n     */\n    function name() public view virtual override returns (string memory) {\n        return _name;\n    }\n\n    /**\n     * @dev 
    See {IERC721Metadata-symbol}.\n     */\n    function symbol() public view virtual override returns (string memory) {\n        return _symbol;\n    
    }\n\n    /**\n     * @dev See {IERC721Metadata-tokenURI}.\n     */\n    function tokenURI(uint256 tokenId) public view virtual override returns 
    (string memory) {\n        require(_exists(tokenId), \"ERC721Metadata: URI query for nonexistent token\");\n\n        string memory baseURI = 
    _baseURI();\n        return bytes(baseURI).length \u003e 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : \"\";\n    }\n\n    /**\n     
    * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each\n     * token will be the concatenation of the `baseURI` and the 
    `tokenId`. Empty\n     * by default, can be overriden in child contracts.\n     */\n    function _baseURI() internal view virtual returns (string 
    memory) {\n        return \"\";\n    }\n\n    /**\n     * @dev See {IERC721-approve}.\n     */\n    function approve(address to, uint256 tokenId) 
    public virtual override {\n        address owner = ERC721.ownerOf(tokenId);\n        require(to != owner, \"ERC721: approval to current owner\"
    );\n\n        require(\n            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),\n            \"ERC721: approve caller is not 
    owner nor approved for all\"\n        );\n\n        _approve(to, tokenId);\n    }\n\n    /**\n     * @dev See {IERC721-getApproved}.\n     */\n    
    function getApproved(uint256 tokenId) public view virtual override returns (address) {\n        require(_exists(tokenId), \"ERC721: approved query 
    for nonexistent token\");\n\n        return _tokenApprovals[tokenId];\n    }\n\n    /**\n     * @dev See {IERC721-setApprovalForAll}.\n     */\n   
     function setApprovalForAll(address operator, bool approved) public virtual override {\n        require(operator != _msgSender(), \"ERC721: approve 
    to caller\");\n\n        _operatorApprovals[_msgSender()][operator] = approved;\n        emit ApprovalForAll(_msgSender(), operator, approved);\n  
      }\n\n    /**\n     * @dev See {IERC721-isApprovedForAll}.\n     */\n    function isApprovedForAll(address owner, address operator) public view 
    virtual override returns (bool) {\n        return _operatorApprovals[owner][operator];\n    }\n\n    /**\n     * @dev See {IERC721-transferFrom}.\n 
        */\n    function transferFrom(\n        address from,\n        address to,\n        uint256 tokenId\n    ) public virtual override {\n        
    //solhint-disable-next-line max-line-length\n        require(_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721: transfer caller is not owner nor 
    approved\");\n\n        _transfer(from, to, tokenId);\n    }\n\n    /**\n     * @dev See {IERC721-safeTransferFrom}.\n     */\n    function 
    safeTransferFrom(\n        address from,\n        address to,\n        uint256 tokenId\n    ) public virtual override {\n        safeTransferFrom
    (from, to, tokenId, \"\");\n    }\n\n    /**\n     * @dev See {IERC721-safeTransferFrom}.\n     */\n    function safeTransferFrom(\n        address 
    from,\n        address to,\n        uint256 tokenId,\n        bytes memory _data\n    ) public virtual override {\n        require
    (_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721: transfer caller is not owner nor approved\");\n        _safeTransfer(from, to, tokenId, _data
    );\n    }\n\n    /**\n     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\n     * are aware 
    of the ERC721 protocol to prevent tokens from being forever locked.\n     *\n     * `_data` is additional data, it has no specified format and it 
    is sent in call to `to`.\n     *\n     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.\n     * implement 
    alternative mechanisms to perform token transfer, such as signature-based.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the 
    zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must exist and be owned by `from`.\n     * - If `to` refers to a 
    smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n     *\n     * Emits a {Transfer} 
    event.\n     */\n    function _safeTransfer(\n        address from,\n        address to,\n        uint256 tokenId,\n        bytes memory _data\n   
     ) internal virtual {\n        _transfer(from, to, tokenId);\n        require(_checkOnERC721Received(from, to, tokenId, _data), \"ERC721: transfer 
    to non ERC721Receiver implementer\");\n    }\n\n    /**\n     * @dev Returns whether `tokenId` exists.\n     *\n     * Tokens can be managed by 
    their owner or approved accounts via {approve} or {setApprovalForAll}.\n     *\n     * Tokens start existing when they are minted (`_mint`),\n     
    * and stop existing when they are burned (`_burn`).\n     */\n    function _exists(uint256 tokenId) internal view virtual returns (bool) {\n       
     return _owners[tokenId] != address(0);\n    }\n\n    /**\n     * @dev Returns whether `spender` is allowed to manage `tokenId`.\n     *\n     * 
    Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view 
    virtual returns (bool) {\n        require(_exists(tokenId), \"ERC721: operator query for nonexistent token\");\n        address owner = ERC721
    .ownerOf(tokenId);\n        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));\n    }\n\n    /**\n  
       * @dev Safely mints `tokenId` and transfers it to `to`.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must not exist.\n     * - If 
    `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n     *\n     * Emits 
    a {Transfer} event.\n     */\n    function _safeMint(address to, uint256 tokenId) internal virtual {\n        _safeMint(to, tokenId, \"\");\n    
    }\n\n    /**\n     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\n     * 
    forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n     */\n    function _safeMint(\n        address to,\n        uint256 
    tokenId,\n        bytes memory _data\n    ) internal virtual {\n        _mint(to, tokenId);\n        require(\n            _checkOnERC721Received
    (address(0), to, tokenId, _data),\n            \"ERC721: transfer to non ERC721Receiver implementer\"\n        );\n    }\n\n    /**\n     * @dev 
    Mints `tokenId` and transfers it to `to`.\n     *\n     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\n     *\n 
        * Requirements:\n     *\n     * - `tokenId` must not exist.\n     * - `to` cannot be the zero address.\n     *\n     * Emits a {Transfer} event
    .\n     */\n    function _mint(address to, uint256 tokenId) internal virtual {\n        require(to != address(0), \"ERC721: mint to the zero 
    address\");\n        require(!_exists(tokenId), \"ERC721: token already minted\");\n\n        _beforeTokenTransfer(address(0), to, tokenId);\n\n   
         _balances[to] += 1;\n        _owners[tokenId] = to;\n\n        emit Transfer(address(0), to, tokenId);\n    }\n\n    /**\n     * @dev Destroys 
    `tokenId`.\n     * The approval is cleared when the token is burned.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     
    *\n     * Emits a {Transfer} event.\n     */\n    function _burn(uint256 tokenId) internal virtual {\n        address owner = ERC721.ownerOf
    (tokenId);\n\n        _beforeTokenTransfer(owner, address(0), tokenId);\n\n        // Clear approvals\n        _approve(address(0), tokenId);\n\n  
          _balances[owner] -= 1;\n        delete _owners[tokenId];\n\n        emit Transfer(owner, address(0), tokenId);\n    }\n\n    /**\n     * @dev 
    Transfers `tokenId` from `from` to `to`.\n     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\n     *\n     * 
    Requirements:\n     *\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must be owned by `from`.\n     *\n     * Emits a 
    {Transfer} event.\n     */\n    function _transfer(\n        address from,\n        address to,\n        uint256 tokenId\n    ) internal virtual 
    {\n        require(ERC721.ownerOf(tokenId) == from, \"ERC721: transfer of token that is not own\");\n        require(to != address(0), \"ERC721: 
    transfer to the zero address\");\n\n        _beforeTokenTransfer(from, to, tokenId);\n\n        // Clear approvals from the previous owner\n       
     _approve(address(0), tokenId);\n\n        _balances[from] -= 1;\n        _balances[to] += 1;\n        _owners[tokenId] = to;\n\n        emit 
    Transfer(from, to, tokenId);\n    }\n\n    /**\n     * @dev Approve `to` to operate on `tokenId`\n     *\n     * Emits a {Approval} event.\n     
    */\n    function _approve(address to, uint256 tokenId) internal virtual {\n        _tokenApprovals[tokenId] = to;\n        emit Approval(ERC721
    .ownerOf(tokenId), to, tokenId);\n    }\n\n    /**\n     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address
    .\n     * The call is not executed if the target address is not a contract.\n     *\n     * @param from address representing the previous owner of 
    the given token ID\n     * @param to target address that will receive the tokens\n     * @param tokenId uint256 ID of the token to be transferred\n 
        * @param _data bytes optional data to send along with the call\n     * @return bool whether the call correctly returned the expected magic 
    value\n     */\n    function _checkOnERC721Received(\n        address from,\n        address to,\n        uint256 tokenId,\n        bytes memory 
    _data\n    ) private returns (bool) {\n        if (to.isContract()) {\n            try IERC721Receiver(to).onERC721Received(_msgSender(), from, 
    tokenId, _data) returns (bytes4 retval) {\n                return retval == IERC721Receiver.onERC721Received.selector;\n            } catch (bytes 
    memory reason) {\n                if (reason.length == 0) {\n                    revert(\"ERC721: transfer to non ERC721Receiver implementer\");\n 
                   } else {\n                    assembly {\n                        revert(add(32, reason), mload(reason))\n                    }\n   
                 }\n            }\n        } else {\n            return true;\n        }\n    }\n\n    /**\n     * @dev Hook that is called before any 
    token transfer. This includes minting\n     * and burning.\n     *\n     * Calling conditions:\n     *\n     * - When `from` and `to` are both non
    -zero, ``from``\u0027s `tokenId` will be\n     * transferred to `to`.\n     * - When `from` is zero, `tokenId` will be minted for `to`.\n     * - 
    When `to` is zero, ``from``\u0027s `tokenId` will be burned.\n     * - `from` and `to` are never both zero.\n     *\n     * To learn more about 
    hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function _beforeTokenTransfer(\n        address from,\n  
          address to,\n        uint256 tokenId\n    ) internal virtual {}\n}\n"},"ERC721Enumerable.sol":{"content":"// SPDX-License-Identifier: 
    MIT\n\npragma solidity ^0.8.0;\n\nimport \"./ERC721.sol\";\nimport \"./IERC721Enumerable.sol\";\n\n/**\n * @dev This implements an optional 
    extension of {ERC721} defined in the EIP that adds\n * enumerability of all the token ids in the contract as well as all token ids owned by each\n 
    * account.\n */\nabstract contract ERC721Enumerable is ERC721, IERC721Enumerable {\n    // Mapping from owner to list of owned token IDs\n    
    mapping(address =\u003e mapping(uint256 =\u003e uint256)) private _ownedTokens;\n\n    // Mapping from token ID to index of the owner tokens list\n 
       mapping(uint256 =\u003e uint256) private _ownedTokensIndex;\n\n    // Array with all token ids, used for enumeration\n    uint256[] private 
    _allTokens;\n\n    // Mapping from token id to position in the allTokens array\n    mapping(uint256 =\u003e uint256) private _allTokensIndex;\n\n  
      /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override
    (IERC165, ERC721) returns (bool) {\n        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);\n   
     }\n\n    /**\n     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\n     */\n    function tokenOfOwnerByIndex(address owner, uint256 index) 
    public view virtual override returns (uint256) {\n        require(index \u003c ERC721.balanceOf(owner), \"ERC721Enumerable: owner index out of 
    bounds\");\n        return _ownedTokens[owner][index];\n    }\n\n    /**\n     * @dev See {IERC721Enumerable-totalSupply}.\n     */\n    function 
    totalSupply() public view virtual override returns (uint256) {\n        return _allTokens.length;\n    }\n\n    /**\n     * @dev See 
    {IERC721Enumerable-tokenByIndex}.\n     */\n    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {\n        
    require(index \u003c ERC721Enumerable.totalSupply(), \"ERC721Enumerable: global index out of bounds\");\n        return _allTokens[index];\n    
    }\n\n    /**\n     * @dev Hook that is called before any token transfer. This includes minting\n     * and burning.\n     *\n     * Calling 
    conditions:\n     *\n     * - When `from` and `to` are both non-zero, ``from``\u0027s `tokenId` will be\n     * transferred to `to`.\n     * - When 
    `from` is zero, `tokenId` will be minted for `to`.\n     * - When `to` is zero, ``from``\u0027s `tokenId` will be burned.\n     * - `from` cannot 
    be the zero address.\n     * - `to` cannot be the zero address.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts
    .adoc#using-hooks[Using Hooks].\n     */\n    function _beforeTokenTransfer(\n        address from,\n        address to,\n        uint256 tokenId\n 
       ) internal virtual override {\n        super._beforeTokenTransfer(from, to, tokenId);\n\n        if (from == address(0)) {\n            
    _addTokenToAllTokensEnumeration(tokenId);\n        } else if (from != to) {\n            _removeTokenFromOwnerEnumeration(from, tokenId);\n        
    }\n        if (to == address(0)) {\n            _removeTokenFromAllTokensEnumeration(tokenId);\n        } else if (to != from) {\n            
    _addTokenToOwnerEnumeration(to, tokenId);\n        }\n    }\n\n    /**\n     * @dev Private function to add a token to this extension\u0027s 
    ownership-tracking data structures.\n     * @param to address representing the new owner of the given token ID\n     * @param tokenId uint256 ID of 
    the token to be added to the tokens list of the given address\n     */\n    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) 
    private {\n        uint256 length = ERC721.balanceOf(to);\n        _ownedTokens[to][length] = tokenId;\n        _ownedTokensIndex[tokenId] = length
    ;\n    }\n\n    /**\n     * @dev Private function to add a token to this extension\u0027s token tracking data structures.\n     * @param tokenId 
    uint256 ID of the token to be added to the tokens list\n     */\n    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {\n        
    _allTokensIndex[tokenId] = _allTokens.length;\n        _allTokens.push(tokenId);\n    }\n\n    /**\n     * @dev Private function to remove a token 
    from this extension\u0027s ownership-tracking data structures. Note that\n     * while the token is not assigned a new owner, the 
    `_ownedTokensIndex` mapping is _not_ updated: this allows for\n     * gas optimizations e.g. when performing a transfer operation (avoiding double 
    writes).\n     * This has O(1) time complexity, but alters the order of the _ownedTokens array.\n     * @param from address representing the 
    previous owner of the given token ID\n     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address\n     
    */\n    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {\n        // To prevent a gap in from\u0027s tokens array
    , we store the last token in the index of the token to delete, and\n        // then delete the last slot (swap and pop).\n\n        uint256 
    lastTokenIndex = ERC721.balanceOf(from) - 1;\n        uint256 tokenIndex = _ownedTokensIndex[tokenId];\n\n        // When the token to delete is 
    the last token, the swap operation is unnecessary\n        if (tokenIndex != lastTokenIndex) {\n            uint256 lastTokenId = 
    _ownedTokens[from][lastTokenIndex];\n\n            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to
    -delete token\n            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token\u0027s index\n        }\n\n        // This also 
    deletes the contents at the last position of the array\n        delete _ownedTokensIndex[tokenId];\n        delete 
    _ownedTokens[from][lastTokenIndex];\n    }\n\n    /**\n     * @dev Private function to remove a token from this extension\u0027s token tracking 
    data structures.\n     * This has O(1) time complexity, but alters the order of the _allTokens array.\n     * @param tokenId uint256 ID of the 
    token to be removed from the tokens list\n     */\n    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {\n        // To 
    prevent a gap in the tokens array, we store the last token in the index of the token to delete, and\n        // then delete the last slot (swap and 
    pop).\n\n        uint256 lastTokenIndex = _allTokens.length - 1;\n        uint256 tokenIndex = _allTokensIndex[tokenId];\n\n        // When the 
    token to delete is the last token, the swap operation is unnecessary. However, since this occurs so\n        // rarely (when the last minted token 
    is burnt) that we still do the swap here to avoid the gas cost of adding\n        // an \u0027if\u0027 statement (like in 
    _removeTokenFromOwnerEnumeration)\n        uint256 lastTokenId = _allTokens[lastTokenIndex];\n\n        _allTokens[tokenIndex] = lastTokenId; // 
    Move the last token to the slot of the to-delete token\n        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token\u0027s 
    index\n\n        // This also deletes the contents at the last position of the array\n        delete _allTokensIndex[tokenId];\n        _allTokens
    .pop();\n    }\n}\n"},"IBarn.sol":{"content":"// SPDX-License-Identifier: MIT LICENSE \n\npragma solidity ^0.8.0;\n\ninterface IBarn {\n  function 
    addManyToBarnAndPack(address account, uint16[] calldata tokenIds) external;\n  function randomWolfOwner(uint256 seed) external view returns 
    (address);\n}"},"IERC165.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC165 
    standard, as defined in the\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\n *\n * Implementers can declare support of contract interfaces, which 
    can then be\n * queried by others ({ERC165Checker}).\n *\n * For an implementation, see {ERC165}.\n */\ninterface IERC165 {\n    /**\n     * @dev 
    Returns true if this contract implements the interface defined by\n     * `interfaceId`. See the corresponding\n     * https://eips.ethereum.org
    /EIPS/eip-165#how-interfaces-are-identified[EIP section]\n     * to learn more about how these ids are created.\n     *\n     * This function call 
    must use less than 30 000 gas.\n     */\n    function supportsInterface(bytes4 interfaceId) external view returns (bool);\n}\n"},"IERC20.sol"
    :{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n 
    */\ninterface IERC20 {\n    /**\n     * @dev Returns the amount of tokens in existence.\n     */\n    function totalSupply() external view returns 
    (uint256);\n\n    /**\n     * @dev Returns the amount of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view 
    returns (uint256);\n\n    /**\n     * @dev Moves `amount` tokens from the caller\u0027s account to `recipient`.\n     *\n     * Returns a boolean 
    value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address recipient, 
    uint256 amount) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to 
    spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or 
    {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * 
    @dev Sets `amount` as the allowance of `spender` over the caller\u0027s tokens.\n     *\n     * Returns a boolean value indicating whether the 
    operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use 
    both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to 
    first reduce the spender\u0027s allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues
    /20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 amount) external 
    returns (bool);\n\n    /**\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\n     * allowance mechanism. `amount` is then 
    deducted from the caller\u0027s\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n   
      * Emits a {Transfer} event.\n     */\n    function transferFrom(\n        address sender,\n        address recipient,\n        uint256 amount\n  
      ) external returns (bool);\n\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n  
       *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n    
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n   
     event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n"},"IERC20Metadata.sol":{"content":"// SPDX-License-Identifier: 
    MIT\n\npragma solidity ^0.8.0;\n\nimport \"./IERC20.sol\";\n\n/**\n * @dev Interface for the optional metadata functions from the ERC20 standard.\n 
    *\n * _Available since v4.1._\n */\ninterface IERC20Metadata is IERC20 {\n    /**\n     * @dev Returns the name of the token.\n     */\n    
    function name() external view returns (string memory);\n\n    /**\n     * @dev Returns the symbol of the token.\n     */\n    function symbol() 
    external view returns (string memory);\n\n    /**\n     * @dev Returns the decimals places of the token.\n     */\n    function decimals() external 
    view returns (uint8);\n}\n"},"IERC721.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"./IERC165.sol\";\n\n
    /**\n * @dev Required interface of an ERC721 compliant contract.\n */\ninterface IERC721 is IERC165 {\n    /**\n     * @dev Emitted when `tokenId` 
    token is transferred from `from` to `to`.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\n\n    
    /**\n     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\n     */\n    event Approval(address indexed owner, address 
    indexed approved, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all 
    of its assets.\n     */\n    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\n\n    /**\n     * @dev Returns 
    the number of tokens in ``owner``\u0027s account.\n     */\n    function balanceOf(address owner) external view returns (uint256 balance);\n\n    
    /**\n     * @dev Returns the owner of the `tokenId` token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    
    function ownerOf(uint256 tokenId) external view returns (address owner);\n\n    /**\n     * @dev Safely transfers `tokenId` token from `from` to 
    `to`, checking first that contract recipients\n     * are aware of the ERC721 protocol to prevent tokens from being forever locked.\n     *\n     * 
    Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must exist 
    and be owned by `from`.\n     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or 
    {setApprovalForAll}.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a 
    safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function safeTransferFrom(\n        address from,\n        address to,\n    
        uint256 tokenId\n    ) external;\n\n    /**\n     * @dev Transfers `tokenId` token from `from` to `to`.\n     *\n     * WARNING: Usage of this 
    method is discouraged, use {safeTransferFrom} whenever possible.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address
    .\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must be owned by `from`.\n     * - If the caller is not `from`, it must be 
    approved to move this token by either {approve} or {setApprovalForAll}.\n     *\n     * Emits a {Transfer} event.\n     */\n    function 
    transferFrom(\n        address from,\n        address to,\n        uint256 tokenId\n    ) external;\n\n    /**\n     * @dev Gives permission to 
    `to` to transfer `tokenId` token to another account.\n     * The approval is cleared when the token is transferred.\n     *\n     * Only a single 
    account can be approved at a time, so approving the zero address clears previous approvals.\n     *\n     * Requirements:\n     *\n     * - The 
    caller must own the token or be an approved operator.\n     * - `tokenId` must exist.\n     *\n     * Emits an {Approval} event.\n     */\n    
    function approve(address to, uint256 tokenId) external;\n\n    /**\n     * @dev Returns the account approved for `tokenId` token.\n     *\n     * 
    Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function getApproved(uint256 tokenId) external view returns (address operator
    );\n\n    /**\n     * @dev Approve or remove `operator` as an operator for the caller.\n     * Operators can call {transferFrom} or 
    {safeTransferFrom} for any token owned by the caller.\n     *\n     * Requirements:\n     *\n     * - The `operator` cannot be the caller.\n     
    *\n     * Emits an {ApprovalForAll} event.\n     */\n    function setApprovalForAll(address operator, bool _approved) external;\n\n    /**\n     * 
    @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.\n     *\n     * See {setApprovalForAll}\n     */\n    function 
    isApprovedForAll(address owner, address operator) external view returns (bool);\n\n    /**\n     * @dev Safely transfers `tokenId` token from 
    `from` to `to`.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n    
     * - `tokenId` token must exist and be owned by `from`.\n     * - If the caller is not `from`, it must be approved to move this token by either 
    {approve} or {setApprovalForAll}.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is 
    called upon a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function safeTransferFrom(\n        address from,\n        
    address to,\n        uint256 tokenId,\n        bytes calldata data\n    ) external;\n}\n"},"IERC721Enumerable.sol":{"content":"// SPDX-License
    -Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"./IERC721.sol\";\n\n/**\n * @title ERC-721 Non-Fungible Token Standard, optional 
    enumeration extension\n * @dev See https://eips.ethereum.org/EIPS/eip-721\n */\ninterface IERC721Enumerable is IERC721 {\n    /**\n     * @dev 
    Returns the total amount of tokens stored by the contract.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * 
    @dev Returns a token ID owned by `owner` at a given `index` of its token list.\n     * Use along with {balanceOf} to enumerate all of 
    ``owner``\u0027s tokens.\n     */\n    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);\n\n    
    /**\n     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.\n     * Use along with {totalSupply} to enumerate 
    all tokens.\n     */\n    function tokenByIndex(uint256 index) external view returns (uint256);\n}\n"},"IERC721Metadata.sol":{"content":"// SPDX
    -License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"./IERC721.sol\";\n\n/**\n * @title ERC-721 Non-Fungible Token Standard, optional 
    metadata extension\n * @dev See https://eips.ethereum.org/EIPS/eip-721\n */\ninterface IERC721Metadata is IERC721 {\n    /**\n     * @dev Returns 
    the token collection name.\n     */\n    function name() external view returns (string memory);\n\n    /**\n     * @dev Returns the token 
    collection symbol.\n     */\n    function symbol() external view returns (string memory);\n\n    /**\n     * @dev Returns the Uniform Resource 
    Identifier (URI) for `tokenId` token.\n     */\n    function tokenURI(uint256 tokenId) external view returns (string memory);\n}\n"}
    ,"IERC721Receiver.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @title ERC721 token receiver interface\n * 
    @dev Interface for any contract that wants to support safeTransfers\n * from ERC721 asset contracts.\n */\ninterface IERC721Receiver {\n    /**\n  
       * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}\n     * by `operator` from `from`, 
    this function is called.\n     *\n     * It must return its Solidity selector to confirm the token transfer.\n     * If any other value is returned 
    or the interface is not implemented by the recipient, the transfer will be reverted.\n     *\n     * The selector can be obtained in Solidity with 
    `IERC721.onERC721Received.selector`.\n     */\n    function onERC721Received(\n        address operator,\n        address from,\n        uint256 
    tokenId,\n        bytes calldata data\n    ) external returns (bytes4);\n}\n"},"ITraits.sol":{"content":"// SPDX-License-Identifier: MIT LICENSE 
    \n\npragma solidity ^0.8.0;\n\ninterface ITraits {\n  function tokenURI(uint256 tokenId) external view returns (string memory);\n}"},"IWoolf.sol"
    :{"content":"// SPDX-License-Identifier: MIT LICENSE\n\npragma solidity ^0.8.0;\n\ninterface IWoolf {\n\n  // struct to store each token\u0027s 
    traits\n  struct SheepWolf {\n    bool isSheep;\n    uint8 fur;\n    uint8 head;\n    uint8 ears;\n    uint8 eyes;\n    uint8 nose;\n    uint8 
    mouth;\n    uint8 neck;\n    uint8 feet;\n    uint8 alphaIndex;\n  }\n\n\n  function getPaidTokens() external view returns (uint256);\n  function 
    getTokenTraits(uint256 tokenId) external view returns (SheepWolf memory);\n}"},"Ownable.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma 
    solidity ^0.8.0;\n\nimport \"./Context.sol\";\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is 
    an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that 
    deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make 
    available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract 
    Ownable is Context {\n    address private _owner;\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n  
      /**\n     * @dev Initializes the contract setting the deployer as the initial owner.\n     */\n    constructor() {\n        _setOwner(_msgSender
    ());\n    }\n\n    /**\n     * @dev Returns the address of the current owner.\n     */\n    function owner() public view virtual returns (address) 
    {\n        return _owner;\n    }\n\n    /**\n     * @dev Throws if called by any account other than the owner.\n     */\n    modifier onlyOwner() 
    {\n        require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n        _;\n    }\n\n    /**\n     * @dev Leaves the contract 
    without owner. It will not be possible to call\n     * `onlyOwner` functions anymore. Can only be called by the current owner.\n     *\n     * NOTE
    : Renouncing ownership will leave the contract without an owner,\n     * thereby removing any functionality that is only available to the owner.\n 
        */\n    function renounceOwnership() public virtual onlyOwner {\n        _setOwner(address(0));\n    }\n\n    /**\n     * @dev Transfers 
    ownership of the contract to a new account (`newOwner`).\n     * Can only be called by the current owner.\n     */\n    function transferOwnership
    (address newOwner) public virtual onlyOwner {\n        require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n        
    _setOwner(newOwner);\n    }\n\n    function _setOwner(address newOwner) private {\n        address oldOwner = _owner;\n        _owner = newOwner;\n 
           emit OwnershipTransferred(oldOwner, newOwner);\n    }\n}\n"},"Pausable.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity 
    ^0.8.0;\n\nimport \"./Context.sol\";\n\n/**\n * @dev Contract module which allows children to implement an emergency stop\n * mechanism that can be 
    triggered by an authorized account.\n *\n * This module is used through inheritance. It will make available the\n * modifiers `whenNotPaused` and 
    `whenPaused`, which can be applied to\n * the functions of your contract. Note that they will not be pausable by\n * simply including this module, 
    only once the modifiers are put in place.\n */\nabstract contract Pausable is Context {\n    /**\n     * @dev Emitted when the pause is triggered 
    by `account`.\n     */\n    event Paused(address account);\n\n    /**\n     * @dev Emitted when the pause is lifted by `account`.\n     */\n    
    event Unpaused(address account);\n\n    bool private _paused;\n\n    /**\n     * @dev Initializes the contract in unpaused state.\n     */\n    
    constructor() {\n        _paused = false;\n    }\n\n    /**\n     * @dev Returns true if the contract is paused, and false otherwise.\n     */\n   
     function paused() public view virtual returns (bool) {\n        return _paused;\n    }\n\n    /**\n     * @dev Modifier to make a function 
    callable only when the contract is not paused.\n     *\n     * Requirements:\n     *\n     * - The contract must not be paused.\n     */\n    
    modifier whenNotPaused() {\n        require(!paused(), \"Pausable: paused\");\n        _;\n    }\n\n    /**\n     * @dev Modifier to make a 
    function callable only when the contract is paused.\n     *\n     * Requirements:\n     *\n     * - The contract must be paused.\n     */\n    
    modifier whenPaused() {\n        require(paused(), \"Pausable: not paused\");\n        _;\n    }\n\n    /**\n     * @dev Triggers stopped state.\n 
        *\n     * Requirements:\n     *\n     * - The contract must not be paused.\n     */\n    function _pause() internal virtual whenNotPaused {\n  
          _paused = true;\n        emit Paused(_msgSender());\n    }\n\n    /**\n     * @dev Returns to normal state.\n     *\n     * Requirements:\n  
       *\n     * - The contract must be paused.\n     */\n    function _unpause() internal virtual whenPaused {\n        _paused = false;\n        emit 
    Unpaused(_msgSender());\n    }\n}\n"},"Strings.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev String 
    operations.\n */\nlibrary Strings {\n    bytes16 private constant _HEX_SYMBOLS = \"0123456789abcdef\";\n\n    /**\n     * @dev Converts a `uint256` 
    to its ASCII `string` decimal representation.\n     */\n    function toString(uint256 value) internal pure returns (string memory) {\n        // 
    Inspired by OraclizeAPI\u0027s implementation - MIT licence\n        // https://github.com/oraclize/ethereum-api/blob
    /b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol\n\n        if (value == 0) {\n            return \"0\";\n        }\n        
    uint256 temp = value;\n        uint256 digits;\n        while (temp != 0) {\n            digits++;\n            temp /= 10;\n        }\n        
    bytes memory buffer = new bytes(digits);\n        while (value != 0) {\n            digits -= 1;\n            buffer[digits] = bytes1(uint8(48 + 
    uint256(value % 10)));\n            value /= 10;\n        }\n        return string(buffer);\n    }\n\n    /**\n     * @dev Converts a `uint256` to 
    its ASCII `string` hexadecimal representation.\n     */\n    function toHexString(uint256 value) internal pure returns (string memory) {\n        
    if (value == 0) {\n            return \"0x00\";\n        }\n        uint256 temp = value;\n        uint256 length = 0;\n        while (temp != 0) 
    {\n            length++;\n            temp \u003e\u003e= 8;\n        }\n        return toHexString(value, length);\n    }\n\n    /**\n     * @dev 
    Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.\n     */\n    function toHexString(uint256 value, uint256 
    length) internal pure returns (string memory) {\n        bytes memory buffer = new bytes(2 * length + 2);\n        buffer[0] = \"0\";\n        
    buffer[1] = \"x\";\n        for (uint256 i = 2 * length + 1; i \u003e 1; --i) {\n            buffer[i] = _HEX_SYMBOLS[value \u0026 0xf];\n         
       value \u003e\u003e= 4;\n        }\n        require(value == 0, \"Strings: hex length insufficient\");\n        return string(buffer);\n    
    }\n}\n"},"Traits.sol":{"content":"// SPDX-License-Identifier: MIT LICENSE\n\npragma solidity ^0.8.0;\nimport \"./Ownable.sol\";\nimport \"./Strings
    .sol\";\nimport \"./ITraits.sol\";\nimport \"./IWoolf.sol\";\n\ncontract Traits is Ownable, ITraits {\n\n  using Strings for uint256;\n\n  // 
    struct to store each trait\u0027s data for metadata and rendering\n  struct Trait {\n    string name;\n    string png;\n  }\n\n  // mapping from 
    trait type (index) to its name\n  string[9] _traitTypes = [\n    \"Fur\",\n    \"Head\",\n    \"Ears\",\n    \"Eyes\",\n    \"Nose\",\n    
    \"Mouth\",\n    \"Neck\",\n    \"Feet\",\n    \"Alpha\"\n  ];\n  // storage of each traits name and base64 PNG data\n  mapping(uint8 =\u003e 
    mapping(uint8 =\u003e Trait)) public traitData;\n  // mapping from alphaIndex to its score\n  string[4] _alphas = [\n    \"8\",\n    \"7\",\n    
    \"6\",\n    \"5\"\n  ];\n\n  IWoolf public woolf;\n\n  constructor() {}\n\n  /** ADMIN */\n\n  function setWoolf(address _woolf) external onlyOwner 
    {\n    woolf = IWoolf(_woolf);\n  }\n\n  /**\n   * administrative to upload the names and images associated with each trait\n   * @param traitType 
    the trait type to upload the traits for (see traitTypes for a mapping)\n   * @param traits the names and base64 encoded PNGs for each trait\n   
    */\n  function uploadTraits(uint8 traitType, uint8[] calldata traitIds, Trait[] calldata traits) external onlyOwner {\n    require(traitIds.length 
    == traits.length, \"Mismatched inputs\");\n    for (uint i = 0; i \u003c traits.length; i++) {\n      traitData[traitType][traitIds[i]] = Trait(\n 
           traits[i].name,\n        traits[i].png\n      );\n    }\n  }\n\n  /** RENDER */\n\n  /**\n   * generates an \u003cimage\u003e element using 
    base64 encoded PNGs\n   * @param trait the trait storing the PNG data\n   * @return the \u003cimage\u003e element\n   */\n  function drawTrait
    (Trait memory trait) internal pure returns (string memory) {\n    return string(abi.encodePacked(\n      \u0027\u003cimage x=\"4\" y=\"4\" width
    =\"32\" height=\"32\" image-rendering=\"pixelated\" preserveAspectRatio=\"xMidYMid\" xlink:href=\"data:image/png;base64,\u0027,\n      trait.png,\n 
         \u0027\"/\u003e\u0027\n    ));\n  }\n\n  /**\n   * generates an entire SVG by composing multiple \u003cimage\u003e elements of PNGs\n   * 
    @param tokenId the ID of the token to generate an SVG for\n   * @return a valid SVG of the Sheep / Wolf\n   */\n  function drawSVG(uint256 tokenId) 
    public view returns (string memory) {\n    IWoolf.SheepWolf memory s = woolf.getTokenTraits(tokenId);\n    uint8 shift = s.isSheep ? 0 : 9;\n\n    
    string memory svgString = string(abi.encodePacked(\n      drawTrait(traitData[0 + shift][s.fur]),\n      s.isSheep ? drawTrait(traitData[1 + 
    shift][s.head]) : drawTrait(traitData[1 + shift][s.alphaIndex]),\n      s.isSheep ? drawTrait(traitData[2 + shift][s.ears]) : \u0027\u0027,\n      
    drawTrait(traitData[3 + shift][s.eyes]),\n      s.isSheep ? drawTrait(traitData[4 + shift][s.nose]) : \u0027\u0027,\n      drawTrait(traitData[5 + 
    shift][s.mouth]),\n      s.isSheep ? \u0027\u0027 : drawTrait(traitData[6 + shift][s.neck]),\n      s.isSheep ? drawTrait(traitData[7 + shift][s
    .feet]) : \u0027\u0027\n    ));\n\n    return string(abi.encodePacked(\n      \u0027\u003csvg id=\"woolf\" width=\"100%\" height=\"100%\" version
    =\"1.1\" viewBox=\"0 0 40 40\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"\u003e\u0027,\n      svgString,\n  
        \"\u003c/svg\u003e\"\n    ));\n  }\n\n  /**\n   * generates an attribute for the attributes array in the ERC721 metadata standard\n   * @param 
    traitType the trait type to reference as the metadata key\n   * @param value the token\u0027s trait associated with the key\n   * @return a JSON 
    dictionary for the single attribute\n   */\n  function attributeForTypeAndValue(string memory traitType, string memory value) internal pure returns 
    (string memory) {\n    return string(abi.encodePacked(\n      \u0027{\"trait_type\":\"\u0027,\n      traitType,\n      \u0027\",\"value\":\"\u0027
    ,\n      value,\n      \u0027\"}\u0027\n    ));\n  }\n\n  /**\n   * generates an array composed of all the individual traits and values\n   * 
    @param tokenId the ID of the token to compose the metadata for\n   * @return a JSON array of all of the attributes for given token ID\n   */\n  
    function compileAttributes(uint256 tokenId) public view returns (string memory) {\n    IWoolf.SheepWolf memory s = woolf.getTokenTraits(tokenId);\n 
       string memory traits;\n    if (s.isSheep) {\n      traits = string(abi.encodePacked(\n        attributeForTypeAndValue(_traitTypes[0], 
    traitData[0][s.fur].name),\u0027,\u0027,\n        attributeForTypeAndValue(_traitTypes[1], traitData[1][s.head].name),\u0027,\u0027,\n        
    attributeForTypeAndValue(_traitTypes[2], traitData[2][s.ears].name),\u0027,\u0027,\n        attributeForTypeAndValue(_traitTypes[3], traitData[3][s
    .eyes].name),\u0027,\u0027,\n        attributeForTypeAndValue(_traitTypes[4], traitData[4][s.nose].name),\u0027,\u0027,\n        
    attributeForTypeAndValue(_traitTypes[5], traitData[5][s.mouth].name),\u0027,\u0027,\n        attributeForTypeAndValue(_traitTypes[7], 
    traitData[7][s.feet].name),\u0027,\u0027\n      ));\n    } else {\n      traits = string(abi.encodePacked(\n        attributeForTypeAndValue
    (_traitTypes[0], traitData[9][s.fur].name),\u0027,\u0027,\n        attributeForTypeAndValue(_traitTypes[1], traitData[10][s.alphaIndex].name
    ),\u0027,\u0027,\n        attributeForTypeAndValue(_traitTypes[3], traitData[12][s.eyes].name),\u0027,\u0027,\n        attributeForTypeAndValue
    (_traitTypes[5], traitData[14][s.mouth].name),\u0027,\u0027,\n        attributeForTypeAndValue(_traitTypes[6], traitData[15][s.neck].name),\u0027
    ,\u0027,\n        attributeForTypeAndValue(\"Alpha Score\", _alphas[s.alphaIndex]),\u0027,\u0027\n      ));\n    }\n    return string(abi
    .encodePacked(\n      \u0027[\u0027,\n      traits,\n      \u0027{\"trait_type\":\"Generation\",\"value\":\u0027,\n      tokenId \u003c= woolf
    .getPaidTokens() ? \u0027\"Gen 0\"\u0027 : \u0027\"Gen 1\"\u0027,\n      \u0027},{\"trait_type\":\"Type\",\"value\":\u0027,\n      s.isSheep ? 
    \u0027\"Sheep\"\u0027 : \u0027\"Wolf\"\u0027,\n      \u0027}]\u0027\n    ));\n  }\n\n  /**\n   * generates a base64 encoded metadata response 
    without referencing off-chain content\n   * @param tokenId the ID of the token to generate the metadata for\n   * @return a base64 encoded JSON 
    dictionary of the token\u0027s metadata and SVG\n   */\n  function tokenURI(uint256 tokenId) public view override returns (string memory) {\n    
    IWoolf.SheepWolf memory s = woolf.getTokenTraits(tokenId);\n\n    string memory metadata = string(abi.encodePacked(\n      \u0027{\"name\": 
    \"\u0027,\n      s.isSheep ? \u0027Sheep #\u0027 : \u0027Wolf #\u0027,\n      tokenId.toString(),\n      \u0027\", \"description\": \"Thousands of 
    Sheep and Wolves compete on a farm in the metaverse. A tempting prize of $WOOL awaits, with deadly high stakes. All the metadata and images are 
    generated and stored 100% on-chain. No IPFS. NO API. Just the Ethereum blockchain.\", \"image\": \"data:image/svg+xml;base64,\u0027,\n      base64
    (bytes(drawSVG(tokenId))),\n      \u0027\", \"attributes\":\u0027,\n      compileAttributes(tokenId),\n      \"}\"\n    ));\n\n    return string
    (abi.encodePacked(\n      \"data:application/json;base64,\",\n      base64(bytes(metadata))\n    ));\n  }\n\n  /** BASE 64 - Written by Brech Devos 
    */\n  \n  string internal constant TABLE = \u0027ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\u0027;\n\n  function base64(bytes 
    memory data) internal pure returns (string memory) {\n    if (data.length == 0) return \u0027\u0027;\n    \n    // load the table into memory\n    
    string memory table = TABLE;\n\n    // multiply by 4/3 rounded up\n    uint256 encodedLen = 4 * ((data.length + 2) / 3);\n\n    // add some extra 
    buffer at the end required for the writing\n    string memory result = new string(encodedLen + 32);\n\n    assembly {\n      // set the actual 
    output length\n      mstore(result, encodedLen)\n      \n      // prepare the lookup table\n      let tablePtr := add(table, 1)\n      \n      // 
    input ptr\n      let dataPtr := data\n      let endPtr := add(dataPtr, mload(data))\n      \n      // result ptr, jump over length\n      let 
    resultPtr := add(result, 32)\n      \n      // run over the input, 3 bytes at a time\n      for {} lt(dataPtr, endPtr) {}\n      {\n          
    dataPtr := add(dataPtr, 3)\n          \n          // read 3 bytes\n          let input := mload(dataPtr)\n          \n          // write 4 
    characters\n          mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(18, input), 0x3F)))))\n          resultPtr := add(resultPtr, 1)\n     
         mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(12, input), 0x3F)))))\n          resultPtr := add(resultPtr, 1)\n          mstore
    (resultPtr, shl(248, mload(add(tablePtr, and(shr( 6, input), 0x3F)))))\n          resultPtr := add(resultPtr, 1)\n          mstore(resultPtr, shl
    (248, mload(add(tablePtr, and(        input,  0x3F)))))\n          resultPtr := add(resultPtr, 1)\n      }\n      \n      // padding with \u0027
    =\u0027\n      switch mod(mload(data), 3)\n      case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) }\n      case 2 { mstore(sub(resultPtr, 1), 
    shl(248, 0x3d)) }\n    }\n    \n    return result;\n  }\n}"},"WOOL.sol":{"content":"// SPDX-License-Identifier: MIT LICENSE\n\npragma solidity ^0.8
    .0;\nimport \"./ERC20.sol\";\nimport \"./Ownable.sol\";\n\ncontract WOOL is ERC20, Ownable {\n\n  // a mapping from an address to whether or not it 
    can mint / burn\n  mapping(address =\u003e bool) controllers;\n  \n  constructor() ERC20(\"WOOL\", \"WOOL\") { }\n\n  /**\n   * mints $WOOL to a 
    recipient\n   * @param to the recipient of the $WOOL\n   * @param amount the amount of $WOOL to mint\n   */\n  function mint(address to, uint256 
    amount) external {\n    require(controllers[msg.sender], \"Only controllers can mint\");\n    _mint(to, amount);\n  }\n\n  /**\n   * burns $WOOL 
    from a holder\n   * @param from the holder of the $WOOL\n   * @param amount the amount of $WOOL to burn\n   */\n  function burn(address from, 
    uint256 amount) external {\n    require(controllers[msg.sender], \"Only controllers can burn\");\n    _burn(from, amount);\n  }\n\n  /**\n   * 
    enables an address to mint / burn\n   * @param controller the address to enable\n   */\n  function addController(address controller) external 
    onlyOwner {\n    controllers[controller] = true;\n  }\n\n  /**\n   * disables an address from minting / burning\n   * @param controller the address 
    to disbale\n   */\n  function removeController(address controller) external onlyOwner {\n    controllers[controller] = false;\n  }\n}"},"Woolf.sol"
    :{"content":"// SPDX-License-Identifier: MIT LICENSE\n\npragma solidity ^0.8.0;\nimport \"./Ownable.sol\";\nimport \"./Pausable.sol\";\nimport \"
    ./ERC721Enumerable.sol\";\nimport \"./IWoolf.sol\";\nimport \"./IBarn.sol\";\nimport \"./ITraits.sol\";\nimport \"./WOOL.sol\";\n\n\ncontract Woolf 
    is IWoolf, ERC721Enumerable, Ownable, Pausable {\n\n  // mint price\n  uint256 public constant MINT_PRICE = .069420 ether;\n  // max number of 
    tokens that can be minted - 50000 in production\n  uint256 public immutable MAX_TOKENS;\n  // number of tokens that can be claimed for free - 20% 
    of MAX_TOKENS\n  uint256 public PAID_TOKENS;\n  // number of tokens have been minted so far\n  uint16 public minted;\n\n  // mapping from tokenId 
    to a struct containing the token\u0027s traits\n  mapping(uint256 =\u003e SheepWolf) public tokenTraits;\n  // mapping from hashed(tokenTrait) to 
    the tokenId it\u0027s associated with\n  // used to ensure there are no duplicates\n  mapping(uint256 =\u003e uint256) public existingCombinations
    ;\n\n  // list of probabilities for each trait type\n  // 0 - 9 are associated with Sheep, 10 - 18 are associated with Wolves\n  uint8[][18] public 
    rarities;\n  // list of aliases for Walker\u0027s Alias algorithm\n  // 0 - 9 are associated with Sheep, 10 - 18 are associated with Wolves\n  
    uint8[][18] public aliases;\n\n  // reference to the Barn for choosing random Wolf thieves\n  IBarn public barn;\n  // reference to $WOOL for 
    burning on mint\n  WOOL public wool;\n  // reference to Traits\n  ITraits public traits;\n\n  /** \n   * instantiates contract and rarity tables\n 
      */\n  constructor(address _wool, address _traits, uint256 _maxTokens) ERC721(\"Wolf Game\", \u0027WGAME\u0027) { \n    wool = WOOL(_wool);\n    
    traits = ITraits(_traits);\n    MAX_TOKENS = _maxTokens;\n    PAID_TOKENS = _maxTokens / 5;\n\n    // I know this looks weird but it saves users 
    gas by making lookup O(1)\n    // A.J. Walker\u0027s Alias Algorithm\n    // sheep\n    // fur\n    rarities[0] = [15, 50, 200, 250, 255];\n    
    aliases[0] = [4, 4, 4, 4, 4];\n    // head\n    rarities[1] = [190, 215, 240, 100, 110, 135, 160, 185, 80, 210, 235, 240, 80, 80, 100, 100, 100, 
    245, 250, 255];\n    aliases[1] = [1, 2, 4, 0, 5, 6, 7, 9, 0, 10, 11, 17, 0, 0, 0, 0, 4, 18, 19, 19];\n    // ears\n    rarities[2] =  [255, 30, 60
    , 60, 150, 156];\n    aliases[2] = [0, 0, 0, 0, 0, 0];\n    // eyes\n    rarities[3] = [221, 100, 181, 140, 224, 147, 84, 228, 140, 224, 250, 160, 
    241, 207, 173, 84, 254, 220, 196, 140, 168, 252, 140, 183, 236, 252, 224, 255];\n    aliases[3] = [1, 2, 5, 0, 1, 7, 1, 10, 5, 10, 11, 12, 13, 14, 
    16, 11, 17, 23, 13, 14, 17, 23, 23, 24, 27, 27, 27, 27];\n    // nose\n    rarities[4] = [175, 100, 40, 250, 115, 100, 185, 175, 180, 255];\n    
    aliases[4] = [3, 0, 4, 6, 6, 7, 8, 8, 9, 9];\n    // mouth\n    rarities[5] = [80, 225, 227, 228, 112, 240, 64, 160, 167, 217, 171, 64, 240, 126, 
    80, 255];\n    aliases[5] = [1, 2, 3, 8, 2, 8, 8, 9, 9, 10, 13, 10, 13, 15, 13, 15];\n    // neck\n    rarities[6] = [255];\n    aliases[6] = [0]
    ;\n    // feet\n    rarities[7] = [243, 189, 133, 133, 57, 95, 152, 135, 133, 57, 222, 168, 57, 57, 38, 114, 114, 114, 255];\n    aliases[7] = [1, 
    7, 0, 0, 0, 0, 0, 10, 0, 0, 11, 18, 0, 0, 0, 1, 7, 11, 18];\n    // alphaIndex\n    rarities[8] = [255];\n    aliases[8] = [0];\n\n    // wolves\n 
       // fur\n    rarities[9] = [210, 90, 9, 9, 9, 150, 9, 255, 9];\n    aliases[9] = [5, 0, 0, 5, 5, 7, 5, 7, 5];\n    // head\n    rarities[10] = 
    [255];\n    aliases[10] = [0];\n    // ears\n    rarities[11] = [255];\n    aliases[11] = [0];\n    // eyes\n    rarities[12] = [135, 177, 219, 141
    , 183, 225, 147, 189, 231, 135, 135, 135, 135, 246, 150, 150, 156, 165, 171, 180, 186, 195, 201, 210, 243, 252, 255];\n    aliases[12] = [1, 2, 3, 
    4, 5, 6, 7, 8, 13, 3, 6, 14, 15, 16, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 26, 26];\n    // nose\n    rarities[13] = [255];\n    aliases[13] 
    = [0];\n    // mouth\n    rarities[14] = [239, 244, 249, 234, 234, 234, 234, 234, 234, 234, 130, 255, 247];\n    aliases[14] = [1, 2, 11, 0, 11, 11
    , 11, 11, 11, 11, 11, 11, 11];\n    // neck\n    rarities[15] = [75, 180, 165, 120, 60, 150, 105, 195, 45, 225, 75, 45, 195, 120, 255];\n    
    aliases[15] = [1, 9, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 14, 12, 14];\n    // feet \n    rarities[16] = [255];\n    aliases[16] = [0];\n    // 
    alphaIndex\n    rarities[17] = [8, 160, 73, 255]; \n    aliases[17] = [2, 3, 3, 3];\n  }\n\n  /** EXTERNAL */\n\n  /** \n   * mint a token - 90% 
    Sheep, 10% Wolves\n   * The first 20% are free to claim, the remaining cost $WOOL\n   */\n  function mint(uint256 amount, bool stake) external 
    payable whenNotPaused {\n    require(tx.origin == _msgSender(), \"Only EOA\");\n    require(minted + amount \u003c= MAX_TOKENS, \"All tokens 
    minted\");\n    require(amount \u003e 0 \u0026\u0026 amount \u003c= 10, \"Invalid mint amount\");\n    if (minted \u003c PAID_TOKENS) {\n      
    require(minted + amount \u003c= PAID_TOKENS, \"All tokens on-sale already sold\");\n      require(amount * MINT_PRICE == msg.value, \"Invalid 
    payment amount\");\n    } else {\n      require(msg.value == 0);\n    }\n\n    uint256 totalWoolCost = 0;\n    uint16[] memory tokenIds = stake ? 
    new uint16[](amount) : new uint16[](0);\n    uint256 seed;\n    for (uint i = 0; i \u003c amount; i++) {\n      minted++;\n      seed = random
    (minted);\n      generate(minted, seed);\n      address recipient = selectRecipient(seed);\n      if (!stake || recipient != _msgSender()) {\n     
       _safeMint(recipient, minted);\n      } else {\n        _safeMint(address(barn), minted);\n        tokenIds[i] = minted;\n      }\n      
    totalWoolCost += mintCost(minted);\n    }\n    \n    if (totalWoolCost \u003e 0) wool.burn(_msgSender(), totalWoolCost);\n    if (stake) barn
    .addManyToBarnAndPack(_msgSender(), tokenIds);\n  }\n\n  /** \n   * the first 20% are paid in ETH\n   * the next 20% are 20000 $WOOL\n   * the next 
    40% are 40000 $WOOL\n   * the final 20% are 80000 $WOOL\n   * @param tokenId the ID to check the cost of to mint\n   * @return the cost of the 
    given token ID\n   */\n  function mintCost(uint256 tokenId) public view returns (uint256) {\n    if (tokenId \u003c= PAID_TOKENS) return 0;\n    if 
    (tokenId \u003c= MAX_TOKENS * 2 / 5) return 20000 ether;\n    if (tokenId \u003c= MAX_TOKENS * 4 / 5) return 40000 ether;\n    return 80000 ether
    ;\n  }\n\n  function transferFrom(\n    address from,\n    address to,\n    uint256 tokenId\n  ) public virtual override {\n    // Hardcode the 
    Barn\u0027s approval so that users don\u0027t have to waste gas approving\n    if (_msgSender() != address(barn))\n      require(_isApprovedOrOwner
    (_msgSender(), tokenId), \"ERC721: transfer caller is not owner nor approved\");\n    _transfer(from, to, tokenId);\n  }\n\n  /** INTERNAL */\n\n  
    /**\n   * generates traits for a specific token, checking to make sure it\u0027s unique\n   * @param tokenId the id of the token to generate traits 
    for\n   * @param seed a pseudorandom 256 bit number to derive traits from\n   * @return t - a struct of traits for the given token ID\n   */\n  
    function generate(uint256 tokenId, uint256 seed) internal returns (SheepWolf memory t) {\n    t = selectTraits(seed);\n    if 
    (existingCombinations[structToHash(t)] == 0) {\n      tokenTraits[tokenId] = t;\n      existingCombinations[structToHash(t)] = tokenId;\n      
    return t;\n    }\n    return generate(tokenId, random(seed));\n  }\n\n  /**\n   * uses A.J. Walker\u0027s Alias algorithm for O(1) rarity table 
    lookup\n   * ensuring O(1) instead of O(n) reduces mint cost by more than 50%\n   * probability \u0026 alias tables are generated off-chain 
    beforehand\n   * @param seed portion of the 256 bit seed to remove trait correlation\n   * @param traitType the trait type to select a trait for \n 
      * @return the ID of the randomly selected trait\n   */\n  function selectTrait(uint16 seed, uint8 traitType) internal view returns (uint8) {\n   
     uint8 trait = uint8(seed) % uint8(rarities[traitType].length);\n    if (seed \u003e\u003e 8 \u003c rarities[traitType][trait]) return trait;\n    
    return aliases[traitType][trait];\n  }\n\n  /**\n   * the first 20% (ETH purchases) go to the minter\n   * the remaining 80% have a 10% chance to 
    be given to a random staked wolf\n   * @param seed a random value to select a recipient from\n   * @return the address of the recipient (either the 
    minter or the Wolf thief\u0027s owner)\n   */\n  function selectRecipient(uint256 seed) internal view returns (address) {\n    if (minted \u003c= 
    PAID_TOKENS || ((seed \u003e\u003e 245) % 10) != 0) return _msgSender(); // top 10 bits haven\u0027t been used\n    address thief = barn
    .randomWolfOwner(seed \u003e\u003e 144); // 144 bits reserved for trait selection\n    if (thief == address(0x0)) return _msgSender();\n    return 
    thief;\n  }\n\n  /**\n   * selects the species and all of its traits based on the seed value\n   * @param seed a pseudorandom 256 bit number to 
    derive traits from\n   * @return t -  a struct of randomly selected traits\n   */\n  function selectTraits(uint256 seed) internal view returns 
    (SheepWolf memory t) {    \n    t.isSheep = (seed \u0026 0xFFFF) % 10 != 0;\n    uint8 shift = t.isSheep ? 0 : 9;\n    seed \u003e\u003e= 16;\n    
    t.fur = selectTrait(uint16(seed \u0026 0xFFFF), 0 + shift);\n    seed \u003e\u003e= 16;\n    t.head = selectTrait(uint16(seed \u0026 0xFFFF), 1 + 
    shift);\n    seed \u003e\u003e= 16;\n    t.ears = selectTrait(uint16(seed \u0026 0xFFFF), 2 + shift);\n    seed \u003e\u003e= 16;\n    t.eyes = 
    selectTrait(uint16(seed \u0026 0xFFFF), 3 + shift);\n    seed \u003e\u003e= 16;\n    t.nose = selectTrait(uint16(seed \u0026 0xFFFF), 4 + shift);\n 
       seed \u003e\u003e= 16;\n    t.mouth = selectTrait(uint16(seed \u0026 0xFFFF), 5 + shift);\n    seed \u003e\u003e= 16;\n    t.neck = selectTrait
    (uint16(seed \u0026 0xFFFF), 6 + shift);\n    seed \u003e\u003e= 16;\n    t.feet = selectTrait(uint16(seed \u0026 0xFFFF), 7 + shift);\n    seed 
    \u003e\u003e= 16;\n    t.alphaIndex = selectTrait(uint16(seed \u0026 0xFFFF), 8 + shift);\n  }\n\n  /**\n   * converts a struct to a 256 bit hash 
    to check for uniqueness\n   * @param s the struct to pack into a hash\n   * @return the 256 bit hash of the struct\n   */\n  function structToHash
    (SheepWolf memory s) internal pure returns (uint256) {\n    return uint256(bytes32(\n      abi.encodePacked(\n        s.isSheep,\n        s.fur,\n 
           s.head,\n        s.eyes,\n        s.mouth,\n        s.neck,\n        s.ears,\n        s.feet,\n        s.alphaIndex\n      )\n    ));\n  
    }\n\n  /**\n   * generates a pseudorandom number\n   * @param seed a value ensure different outcomes for different sources in the same block\n   * 
    @return a pseudorandom value\n   */\n  function random(uint256 seed) internal view returns (uint256) {\n    return uint256(keccak256(abi
    .encodePacked(\n      tx.origin,\n      blockhash(block.number - 1),\n      block.timestamp,\n      seed\n    )));\n  }\n\n  /** READ */\n\n  
    function getTokenTraits(uint256 tokenId) external view override returns (SheepWolf memory) {\n    return tokenTraits[tokenId];\n  }\n\n  function 
    getPaidTokens() external view override returns (uint256) {\n    return PAID_TOKENS;\n  }\n\n  /** ADMIN */\n\n  /**\n   * called after deployment 
    so that the contract can get random wolf thieves\n   * @param _barn the address of the Barn\n   */\n  function setBarn(address _barn) external 
    onlyOwner {\n    barn = IBarn(_barn);\n  }\n\n  /**\n   * allows owner to withdraw funds from minting\n   */\n  function withdraw() external 
    onlyOwner {\n    payable(owner()).transfer(address(this).balance);\n  }\n\n  /**\n   * updates the number of tokens for sale\n   */\n  function 
    setPaidTokens(uint256 _paidTokens) external onlyOwner {\n    PAID_TOKENS = _paidTokens;\n  }\n\n  /**\n   * enables owner to pause / unpause 
    minting\n   */\n  function setPaused(bool _paused) external onlyOwner {\n    if (_paused) _pause();\n    else _unpause();\n  }\n\n  /** RENDER 
    */\n\n  function tokenURI(uint256 tokenId) public view override returns (string memory) {\n    require(_exists(tokenId), \"ERC721Metadata: URI 
    query for nonexistent token\");\n    return traits.tokenURI(tokenId);\n  }\n}"}}
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// Copyright (C) 2015, 2016, 2017 Dapphub
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.4.18;
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