I took the index of the words, converted the variety to binary, extra a few zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to convert it to binary, additional three zeros for the 8 digits in the binary and received 00000010011 which translates to 19 in https://minibookmarking.com/story19065070/fascination-about-invalid-bip39-phrase