I took the index in the words, converted the quantity to binary, additional a few zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, additional 3 zeros to your 8 digits from the binary and got 00000010011 which translates to 19 in https://cyberbookmarking.com/story18785923/the-5-second-trick-for-ledger-seed-phrase-bip39