I took the index on the words, transformed the number to binary, additional three zeros, calculated the sha256 digest, took the very first Section of the hexadecimal to convert it to binary, included three zeros into the 8 digits of your binary and got 00000010011 which interprets to 19 in https://geilebookmarks.com/story18790767/not-known-facts-about-bip39-english-words