I took the index in the words, converted the selection to binary, added 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, extra a few zeros into the eight digits with the binary and received 00000010011 which translates to 19 in https://bookmarkzap.com/story18705193/a-secret-weapon-for-bip39-words-to-numbers