I took the index of the words, converted the variety to binary, additional three zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to convert it to binary, additional 3 zeros to the 8 digits in the binary and obtained 00000010011 which translates to 19 in https://thesocialcircles.com/story5169952/fascination-about-invalid-bip39-phrase