I took the index of the words, transformed the quantity to binary, extra a few zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to transform it to binary, included three zeros for the eight digits of your binary and bought 00000010011 which interprets to 19 in https://7bookmarks.com/story18785787/the-basic-principles-of-bip39-passphrase-generator