I took the index from the words, converted the variety to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, included a few zeros into the eight digits of your binary and got 00000010011 which translates to 19 in https://bookmarksusa.com/story19024572/considerations-to-know-about-bip39-word-list-pdf