I took the index from the words, transformed the number to binary, extra 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, added three zeros to the 8 digits with the binary and got 00000010011 which interprets to 19 in decimal. https://hylistings.com/story20647955/the-basic-principles-of-bip39-passphrase-generator