I took the index with the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the very first part of the hexadecimal to convert it to binary, added a few zeros to the 8 digits from the binary and received 00000010011 which translates to 19 https://nanobookmarking.com/story18730195/a-review-of-bip39-passphrase