I took the index on the words, converted the quantity to binary, added three zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to convert it to binary, extra a few zeros to your eight digits with the binary and obtained 00000010011 which translates to 19 https://trackbookmark.com/story20337359/ledger-seed-phrase-bip39-no-further-a-mystery