michaelredman
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| /** | |
| *Submitted for verification at Etherscan.io on 2017-11-28 | |
| */ | |
| // https://cn.etherscan.com/address/0xdac17f958d2ee523a2206206994597c13d831ec7#code | |
| pragma solidity ^0.4.17; | |
| /** | |
| * @title SafeMath | |
| * @dev Math operations with safety checks that throw on error |