I took the index from the words, transformed the quantity to binary, extra three zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, additional three zeros to the eight digits from the binary and acquired 00000010011 which translates to 19 in decimal. https://bookmarkyourpage.com/story4349643/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator