I took the index with the words, converted the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to convert it to binary, extra 3 zeros towards the eight digits of the binary and got 00000010011 which interprets to 19 in decimal. https://www.tumblr.com/generalllamacolor/772952501127380992/opening-the-globe-of-bip39-a-comprehensive-guide