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pragma solidity ^0.4.18;
// ----------------------------------------------------------------------------
// 'DENtoken'
//
// NAME     : DENtoken
// Symbol   : DEN
// Total supply: 50,000,000
// Decimals    : 18
// ----------------------------------------------------------------------------
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
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