contract StandardBurnableToken is BurnableToken, StandardToken {

  /**
   * @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]);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    _burn(_from, _value);
  }
}
/**
 * @title Standard Burnable Token
 * @dev Adds burnFrom method to ERC20 implementations
 */
function burnFrom(address _from, uint256 _value) public {
    require(_value <= allowed[_from][msg.sender]);
    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
 */