I took the index in the words, converted the number to binary, extra a few zeros, calculated the sha256 digest, took the first part of the hexadecimal to convert it to binary, extra three zeros for the 8 digits on the binary and got 00000010011 which interprets to 19 in https://bookmarkerz.com/story18711281/the-greatest-guide-to-seed-phrase-bip39