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| pragma solidity ^0.4.18; | |
| // File: zeppelin-solidity/contracts/math/SafeMath.sol | |
| /** | |
| * @title SafeMath | |
| * @dev Math operations with safety checks that throw on error | |
| */ | |
| library SafeMath { | |
| function mul(uint256 a, uint256 b) internal pure returns (uint256) { |