I took the index of the words, converted the number to binary, extra a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, additional 3 zeros towards the eight digits of your binary and received 00000010011 which translates to 19 in https://bookmarkpath.com/story19110511/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting