I took the index on the words, converted the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, extra three zeros to your 8 digits of the binary and acquired 00000010011 which interprets to 19 in decimal. https://techonpage.com/story4254249/a-review-of-bip39-passphrase