I took the index from the words, converted the selection to binary, included three zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to convert it to binary, extra a few zeros into the eight digits of the binary and got 00000010011 which interprets to 19 https://gatherbookmarks.com/story19591116/the-basic-principles-of-bip39-passphrase-generator