I took the index from the words, converted the number to binary, included a few zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, added a few zeros to the eight digits on the binary and obtained 00000010011 which translates to 19 https://postheaven.net/tiablexcen/mastering-your-copyright-protection-the-essential-overview-to-bip39-passphrases