I took the index with the words, transformed the number to binary, included a few zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to convert it to binary, extra a few zeros into the eight digits in the binary and received 00000010011 which translates to 19 https://bookmarksknot.com/story20505048/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool