I took the index of your words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to convert it to binary, additional 3 zeros on the eight digits of your binary and got 00000010011 which interprets to 19 in decimal. https://minibookmarking.com/story19722090/fascination-about-bip39-english-words