contract BasicToken is ERC20Basic {
        using SafeMath for uint256;
    
        mapping(address => uint256) balances;
    
        /**
        * @dev transfer token for a specified address
        * @param _to The address to transfer to.
        * @param _value The amount to be transferred.
        */
        function _transfer(address _to, uint256 _value) internal returns (bool) {
            require(_to != address(0));
    
            // SafeMath.sub will throw if there is not enough balance.
            balances[msg.sender] = balances[msg.sender].sub(_value);
            balances[_to] = balances[_to].add(_value);
            emit Transfer(msg.sender, _to, _value);
            return true;
        }
    
        /**
        * @dev Gets the balance of the specified address.
        * @param _owner The address to query the the balance of.
        * @return An uint256 representing the amount owned by the passed address.
        */
        function balanceOf(address _owner) public view returns (uint256 balance) {
            return balances[_owner];
        }
    }
/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
function _transfer(address _to, uint256 _value) internal returns (bool) {
            require(_to != address(0));
    
            // SafeMath.sub will throw if there is not enough balance.
            balances[msg.sender] = balances[msg.sender].sub(_value);
            balances[_to] = balances[_to].add(_value);
            emit Transfer(msg.sender, _to, _value);
            return true;
        }
/**
 * @dev transfer token for a specified address
 * @param _to The address to transfer to.
 * @param _value The amount to be transferred.
 */