I took the index of the words, transformed the number to binary, added a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, extra 3 zeros for the 8 digits with the binary and got 00000010011 which interprets to 19 in https://yoursocialpeople.com/story4322216/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting