I took the index with the words, transformed the selection to binary, included a few zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to convert it to binary, additional three zeros for the 8 digits on the binary and acquired 00000010011 which translates to 19 in https://socialdummies.com/story4040820/a-secret-weapon-for-bip39-words-to-numbers