I took the index on the words, converted the number to binary, included a few zeros, calculated the sha256 digest, took the first Element of the hexadecimal to convert it to binary, additional three zeros for the 8 digits from the binary and got 00000010011 which interprets to 19 in https://tvsocialnews.com/story4657511/top-guidelines-of-bip39-word-list-pdf