I took the index with the words, converted the variety to binary, additional 3 zeros, calculated the sha256 digest, took the first Element of the hexadecimal to convert it to binary, included three zeros to the eight digits in the binary and got 00000010011 which interprets to 19 in decimal. https://bookmarksaifi.com/story19686434/little-known-facts-about-bip39-words