I took the index from the words, converted the selection to binary, extra 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to convert it to binary, additional 3 zeros for the 8 digits with the binary and received 00000010011 which translates to 19 in decimal. https://toplistar.com/story20711484/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting