I took the index of your words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to convert it to binary, added a few zeros to the eight digits of your binary and obtained 00000010011 which translates to 19 in https://opensocialfactory.com/story19310949/facts-about-bip39-seed-phrase-word-list-revealed