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// File: contracts/common/governance/IGovernance.sol
pragma solidity ^0.5.2;
interface IGovernance {
    function update(address target, bytes calldata data) external;
}
// File: contracts/common/governance/Governable.sol
pragma solidity ^0.5.2;
contract Governable {
    IGovernance public governance;
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/**
Matic network contracts
*/
pragma solidity ^0.5.2;
/**
 * @title IERC165
 * @dev https://eips.ethereum.org/EIPS/eip-165
 */
interface IERC165 {
    /**
     * @notice Query if a contract implements an interface
     * @param interfaceId The interface identifier, as specified in ERC-165
     * @dev Interface identification is specified in ERC-165. This function
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// File: contracts/common/governance/IGovernance.sol
pragma solidity ^0.5.2;
interface IGovernance {
    function update(address target, bytes calldata data) external;
}
// File: contracts/common/governance/Governable.sol
pragma solidity ^0.5.2;
contract Governable {
    IGovernance public governance;
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pragma solidity 0.5.2;
// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol
/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
    function transfer(address to, uint256 value) external returns (bool);
    function approve(address spender, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
    function totalSupply() external view returns (uint256);
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// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol
pragma solidity ^0.5.2;
/**
 * @title ERC20 interface
 * @dev see https://eips.ethereum.org/EIPS/eip-20
 */
interface IERC20 {
    function transfer(address to, uint256 value) external returns (bool);
    function approve(address spender, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
    function totalSupply() external view returns (uint256);
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/**
Matic network contracts
*/
pragma solidity ^0.5.2;
/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
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/**
Matic network contracts
*/
pragma solidity ^0.5.2;
interface IGovernance {
    function update(address target, bytes calldata data) external;
}
contract Governable {
    IGovernance public governance;
    constructor(address _governance) public {
        governance = IGovernance(_governance);
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// File: openzeppelin-solidity/contracts/math/SafeMath.sol
pragma solidity ^0.5.2;
/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error
 */
library SafeMath {
    /**
     * @dev Multiplies two unsigned integers, reverts on overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
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/**
Matic network contracts
*/
pragma solidity ^0.5.2;
contract IERC721Receiver {
    /**
     * @notice Handle the receipt of an NFT
     * @dev The ERC721 smart contract calls this function on the recipient
     * after a `safeTransfer`. This function MUST return the function selector,
     * otherwise the caller will revert the transaction. The selector to be
     * returned can be obtained as `this.onERC721Received.selector`. This
     * function MAY throw to revert and reject the transfer.
     * Note: the ERC721 contract address is always the message sender.
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