contract ERC20Burnable is ERC20 {

    /**
    * @dev Burns a specific amount of tokens.
    * @param value The amount of token to be burned.
    */
    function burn(uint256 value) public {
        _burn(msg.sender, value);
    }

    /**
    * @dev Burns a specific amount of tokens from the target address and decrements allowance
    * @param from address The address which you want to send tokens from
    * @param value uint256 The amount of token to be burned
    */
    function burnFrom(address from, uint256 value) public {
        _burnFrom(from, value);
    }

    /**
    * @dev Overrides ERC20._burn in order for burn and burnFrom to emit
    * an additional Burn event.
    */
    function _burn(address who, uint256 value) internal {
        super._burn(who, value);
    }
}
/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
function _burn(address who, uint256 value) internal {
        super._burn(who, value);
    }
/**
 * @dev Overrides ERC20._burn in order for burn and burnFrom to emit
 * an additional Burn event.
 */