I took the index on the words, transformed the selection to binary, included a few zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, extra 3 zeros to the eight digits from the binary and got 00000010011 which interprets to 19 in https://gorillasocialwork.com/story20601313/considerations-to-know-about-bip39-word-list-pdf