I took the index of the words, converted the quantity to binary, extra a few zeros, calculated the sha256 digest, took the first Element of the hexadecimal to transform it to binary, added 3 zeros to your eight digits with the binary and received 00000010011 which translates to 19 in https://captainbookmark.com/story19555601/the-definitive-guide-to-bip39-seed-phrase