I took the index from the words, transformed the amount to binary, added a few zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, added three zeros to your eight digits of the binary and got 00000010011 which translates to 19 in https://maroonbookmarks.com/story18730866/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator