I took the index in the words, transformed the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, extra 3 zeros to your eight digits from the binary and received 00000010011 which translates to 19 in decimal. https://yxzbookmarks.com/story18785226/ledger-seed-phrase-bip39-no-further-a-mystery