I took the index from the words, transformed the quantity to binary, added three zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, additional 3 zeros on the eight digits of your binary and bought 00000010011 which translates to 19 in decimal. https://hylistings.com/story19963302/5-simple-techniques-for-bip39-word-list-pdf