I took the index on the words, converted the selection to binary, additional a few zeros, calculated the sha256 digest, took the primary Section of the hexadecimal to convert it to binary, included three zeros on the eight digits with the binary and obtained 00000010011 which translates to 19 in https://bookmarkassist.com/story18939683/new-step-by-step-map-for-ledger-seed-phrase-bip39