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// File: @axie/contract-library/contracts/access/HasAdmin.sol
pragma solidity ^0.5.2;
contract HasAdmin {
  event AdminChanged(address indexed _oldAdmin, address indexed _newAdmin);
  event AdminRemoved(address indexed _oldAdmin);
  address public admin;
  modifier onlyAdmin {
    require(msg.sender == admin);
    _;
  }
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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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// File: @axie/contract-library/contracts/cryptography/ECVerify.sol
pragma solidity ^0.5.2;
library ECVerify {
  enum SignatureMode {
    EIP712,
    GETH,
    TREZOR
  }
  function recover(bytes32 _hash, bytes memory _signature) internal pure returns (address _signer) {
    return recover(_hash, _signature, 0);
  }
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// File: @axie/contract-library/contracts/access/HasAdmin.sol
pragma solidity ^0.5.2;
contract HasAdmin {
  event AdminChanged(address indexed _oldAdmin, address indexed _newAdmin);
  event AdminRemoved(address indexed _oldAdmin);
  address public admin;
  modifier onlyAdmin {
    require(msg.sender == admin);
    _;
  }
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// File: @axie/contract-library/contracts/math/SafeMath.sol
pragma solidity ^0.5.2;
library SafeMath {
  function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
    c = a + b;
    require(c >= a);
  }
  function sub(uint256 a, uint256 b) internal pure returns (uint256 c) {
    require(b <= a);
    return a - b;
  }
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