I took the index from the words, transformed the variety to binary, extra a few zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, included three zeros for the eight digits in the binary and received 00000010011 which translates to 19 https://bookmark-group.com/story4617320/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool