I took the index of the words, transformed the quantity to binary, extra three zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, additional a few zeros into the eight digits of your binary and obtained 00000010011 which translates to 19 in https://thekiwisocial.com/story4244436/the-basic-principles-of-bip39-passphrase-generator