I took the index in the words, converted the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to convert it to binary, added three zeros towards the 8 digits from the binary and received 00000010011 which translates to 19 https://exactlybookmarks.com/story18814878/ledger-seed-phrase-bip39-no-further-a-mystery