I took the index with the words, transformed the range to binary, included a few zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, additional 3 zeros to the 8 digits from the binary and got 00000010011 which interprets to 19 in https://sergiorgzi464.weebly.com/blog/from-words-to-wealth-exactly-how-to-properly-use-bip39-passphrases-for-your-copyright-budgets