I took the index from the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, included three zeros to your 8 digits on 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