I took the index in the words, converted the number to binary, extra 3 zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to convert it to binary, extra three zeros into the eight digits from the binary and got 00000010011 which interprets to 19 in https://mysterybookmarks.com/story18994232/top-guidelines-of-bip39-word-list-pdf