I took the index of the words, converted the selection to binary, included a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, added a few zeros for the eight digits from the binary and obtained 00000010011 which translates to 19 https://bookmark-nation.com/story19311657/ledger-seed-phrase-bip39-no-further-a-mystery