I took the index of the words, transformed the quantity to binary, included 3 zeros, calculated the sha256 digest, took the very first Component of the hexadecimal to transform it to binary, additional 3 zeros into the eight digits from the binary and got 00000010011 which interprets to 19 in https://pr1bookmarks.com/story19139135/considerations-to-know-about-bip39-seed-phrase-generator