I took the index of the words, converted the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to convert it to binary, additional three zeros to your eight digits on the binary and obtained 00000010011 which translates to 19 in https://eternalbookmarks.com/story18711171/a-secret-weapon-for-bip39-words-to-numbers