I took the index on the words, transformed the amount to binary, added 3 zeros, calculated the sha256 digest, took the main Section of the hexadecimal to convert it to binary, included three zeros on the eight digits in the binary and obtained 00000010011 which translates to 19 in decimal. https://bookmarkwuzz.com/story19017748/the-basic-principles-of-bip39-passphrase-generator