I took the index with the words, transformed the number to binary, extra a few zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to transform it to binary, extra 3 zeros to your eight digits of your binary and bought 00000010011 which interprets to 19 https://bookmarkusers.com/story18657886/not-known-factual-statements-about-bip39-explained