I took the index from the words, converted the quantity to binary, additional a few zeros, calculated the sha256 digest, took the very first part of the hexadecimal to convert it to binary, extra 3 zeros to your eight digits in the binary and obtained 00000010011 which interprets to 19 https://businessbookmark.com/story4277658/a-secret-weapon-for-bip39-words-to-numbers