I took the index in the words, converted the variety to binary, additional 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, extra three zeros for the eight digits from the binary and got 00000010011 which translates to 19 in decimal. https://ztndz.com/story21881849/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting