I took the index of your 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 with the binary and obtained 00000010011 which translates to 19 in https://bookmarkstime.com/story19190586/considerations-to-know-about-bip39-word-list-pdf