I took the index in the words, transformed the number to binary, included a few zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to transform it to binary, included three zeros on the 8 digits with the binary and acquired 00000010011 which interprets to 19 in https://thegreatbookmark.com/story18873884/the-basic-principles-of-bip39-passphrase-generator