I took the index on the words, converted the variety to binary, included 3 zeros, calculated the sha256 digest, took the 1st Section of the hexadecimal to transform it to binary, extra a few zeros for the eight digits with the binary and received 00000010011 which translates to 19 in https://eternalbookmarks.com/story18660554/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool