Recovering this 26-word mnemonic phrase, assuming it follows BIP-39 and only knowing the order of 6 words, would take too much time to brute force and would be insufficient. To recover it, you should try to reduce the number of possibilities by, for example, gaining knowledge about the order of the remaining 14 words. This would significantly lower the number of possibilities and increase the chances of successfully recovering it through brute force. Otherwise the numbers are way too big