I took the index of the words, transformed the range to binary, extra 3 zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, included a few zeros to your eight digits with the binary and obtained 00000010011 which translates to 19 in https://prbookmarkingwebsites.com/story21914652/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool