I took the index on the words, converted the variety to binary, extra 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, additional a few zeros to the 8 digits with the binary and received 00000010011 which translates to 19 https://bookmarkpressure.com/story19535579/invalid-bip39-phrase-things-to-know-before-you-buy