I took the index from the words, transformed the selection to binary, extra a few zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, extra 3 zeros to your eight digits in the binary and acquired 00000010011 which translates to 19 in https://bookmark-media.com/story18952985/getting-my-bip39-words-to-numbers-to-work