contract BurnableToken is BasicToken {
	
	event Burn(address indexed burner, uint256 value);
	
	/**
	 * @dev Burns a specific amount of tokens.
	 * @param _value The amount of token to be burned.
	 */
	function burn(uint256 _value) public {
		require(_value <= balances[msg.sender]);
		// no need to require value <= totalSupply, since that would imply the
		// sender's balance is greater than the totalSupply, which *should* be an assertion failure
		
		address burner = msg.sender;
		balances[burner] = balances[burner].sub(_value);
		totalSupply_ = totalSupply_.sub(_value);
		emit Burn(burner, _value);
		emit Transfer(burner, address(0), _value);
	}
}
/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
function burn(uint256 _value) public {
	require(_value <= balances[msg.sender]);
	// no need to require value <= totalSupply, since that would imply the
	// sender's balance is greater than the totalSupply, which *should* be an assertion failure
		
	address burner = msg.sender;
	balances[burner] = balances[burner].sub(_value);
	totalSupply_ = totalSupply_.sub(_value);
	emit Burn(burner, _value);
	emit Transfer(burner, address(0), _value);
}

/**
 	 * @dev Burns a specific amount of tokens.
 	 * @param _value The amount of token to be burned.
 	 */