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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) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
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pragma solidity ^0.4.10;
// Copyright 2017 Bittrex
contract AbstractSweeper {
    function sweep(address token, uint amount) returns (bool);
    function () { throw; }
    Controller controller;
    function AbstractSweeper(address _controller) {
        controller = Controller(_controller);
    }
    modifier canSweep() {
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