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