I took the index with the words, transformed the variety to binary, extra a few zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, included 3 zeros to your eight digits on the binary and bought 00000010011 which interprets to 19 in https://bookmarksoflife.com/story4540278/a-secret-weapon-for-bip39-words-to-numbers