I took the index in the words, converted the variety to binary, extra 3 zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, additional three zeros to the eight digits of the binary and obtained 00000010011 which interprets to 19 in decimal. https://expressbookmark.com/story18814432/bip39-seed-phrase-mnemonics-generator-an-overview