I took the index from the words, transformed the number to binary, additional 3 zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to convert it to binary, added three zeros to the 8 digits of your binary and got 00000010011 which interprets to 19 in decimal. https://thefairlist.com/story8853644/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting