contract DynoToken is BurnableToken, StandardToken {

    string public constant name = "DYNO Token";
    string public constant symbol = "DYNO";
    uint8 public constant decimals = 18;

    uint256 public constant INITIAL_SUPPLY = 1000000000 * (10 ** uint256(decimals));

    /**
     * @dev Constructor that gives msg.sender all of existing tokens.
     */
    constructor() public {
        totalSupply_ = INITIAL_SUPPLY;
        balances[msg.sender] = INITIAL_SUPPLY;
        emit Transfer(0x0, msg.sender, INITIAL_SUPPLY);
    }

    /**
    * @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 {
        require(_value <= allowed[_from][msg.sender]);
        // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
        // this function needs to emit an event with the updated approval.
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        _burn(_from, _value);
    }

}
function burnFrom(address _from, uint256 _value) public {
    require(_value <= allowed[_from][msg.sender]);
    // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
    // this function needs to emit an event with the updated approval.
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    _burn(_from, _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
 */