I took the index on the words, converted the selection to binary, included 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, extra 3 zeros towards the 8 digits on the binary and got 00000010011 which interprets to 19 in decimal. https://bookmarkforce.com/story19076604/top-guidelines-of-bip39-word-list-pdf