I took the index from the words, converted the variety to binary, included 3 zeros, calculated the sha256 digest, took the main part of the hexadecimal to transform it to binary, included a few zeros to the 8 digits in the binary and received 00000010011 which translates to 19 in https://bookmarkrange.com/story20245007/a-secret-weapon-for-bip39-words-to-numbers