I took the index on the words, transformed the selection to binary, included three zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, included three zeros for the eight digits of the binary and acquired 00000010011 which translates to 19 in decimal. https://myfirstbookmark.com/story18883475/the-basic-principles-of-bip39-passphrase-generator