I took the index with the words, transformed the number to binary, extra three zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to convert it to binary, extra a few zeros for the 8 digits on the binary and obtained 00000010011 which translates to 19 https://myfirstbookmark.com/story19499446/not-known-facts-about-bip39-english-words