I took the index on the words, converted the number to binary, extra a few zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to convert it to binary, extra 3 zeros into the eight digits of the binary and received 00000010011 which interprets to 19 in https://bookmarkstown.com/story19697031/the-definitive-guide-to-bip39-seed-phrase