I took the index with the words, transformed the quantity to binary, additional three zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to convert it to binary, extra 3 zeros for the 8 digits with the binary and bought 00000010011 which translates to 19 in https://bookmarksurl.com/story4299574/ledger-seed-phrase-bip39-no-further-a-mystery