I took the index in the words, converted the variety to binary, added 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, extra a few zeros for the eight digits from the binary and obtained 00000010011 which translates to 19 in https://top100bookmark.com/story19196407/new-step-by-step-map-for-ledger-seed-phrase-bip39