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library SafeMath    - function mul(uint256 a, uint256 b)    - function div(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b)    - function add(uint256 a, uint256 b)  contract Ownable    - function renounceOwnership()    - function transferOwnership(address _n ...    - function _transferOwnership(address _ ...  contract ERC20Basic    - function totalSupply()    - function balanceOf(address who)    - function transfer(address to, uint256 ... library SafeERC20    - function safeTransfer(ERC20 token, ad ...    - function safeTransferFrom(    - function safeApprove(ERC20 token, add ...  contract ERC20 is ERC20Basic    - function allowance(address owner, add ...    - function transferFrom(address from, a ...    - function approve(address spender, uin ...  contract BasicToken is ERC20Basic    - function totalSupply()    - function transfer(address _to, uint25 ...    - function balanceOf(address _owner)    - function checkUsers(address _from, ad ...  contract StandardToken is ERC20, B ...    - function transferFrom(    - function approve(address _spender, ui ...    - function allowance(  contract BulleonPromoToken is Stan ... *    - function massNotify(address[] _owners ...    - function setDex(address _dex)  contract BulDex is Ownable    - function exchange(address _user, uint ...    - function claimTokens(address _token)

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/**
 *Submitted for verification at Etherscan.io on 2018-08-27
*/
pragma solidity ^0.4.24;
/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }
        c = a * b;
        assert(c / a == b);
        return c;
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