I took the index of your words, transformed the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, extra three zeros on the eight digits from the binary and obtained 00000010011 which interprets to 19 in decimal. https://thebookmarklist.com/story18977907/examine-this-report-on-bip39-passphrase