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pragma solidity ^0.4.21; | |
contract ERC20Basic { | |
function totalSupply() public view returns (uint256); | |
function balanceOf(address who) public view returns (uint256); | |
function transfer(address to, uint256 value) public returns (bool); | |
event Transfer(address indexed from, address indexed to, uint256 value); | |
} | |
contract ERC20 is ERC20Basic { |