I took the index on the words, transformed the amount to binary, extra a few zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, extra 3 zeros to the 8 digits with the binary and received 00000010011 which interprets to 19 in https://doctorbookmark.com/story19037186/fascination-about-invalid-bip39-phrase