I took the index on the words, converted the selection to binary, included a few zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, added three zeros on the eight digits in the binary and obtained 00000010011 which translates to 19 in https://socialmphl.com/story21570665/the-basic-principles-of-bip39-passphrase-generator