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 contract ERC20Basic    - function totalSupply()    - function balanceOf(address _who)    - function transfer(address _to, uint25 ... 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 BasicToken is ERC20Basic    - function totalSupply()    - function transfer(address _to, uint25 ...    - function balanceOf(address _owner)  contract ERC20 is ERC20Basic    - function allowance(address _owner, ad ...    - function transferFrom(address _from, ...    - function approve(address _spender, ui ...  contract StandardToken is ERC20, B ...    - function transferFrom(    - function approve(address _spender, ui ...    - function allowance(    - function increaseApproval(    - function decreaseApproval(  contract TileToken is StandardToke ... *

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/**
 *Submitted for verification at Etherscan.io on 2018-08-27
*/
//File: node_modules\openzeppelin-solidity\contracts\token\ERC20\ERC20Basic.sol
pragma solidity ^0.4.24;
/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * See https://github.com/ethereum/EIPs/issues/179
 */
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);
}
//File: node_modules\openzeppelin-solidity\contracts\math\SafeMath.sol
pragma solidity ^0.4.24;
/**
 * @title SafeMath
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