I took the index of the words, transformed the number to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, additional three zeros towards the 8 digits from the binary and received 00000010011 which translates to 19 in decimal. https://kingslists.com/story20057355/top-guidelines-of-bip39-word-list-pdf