I took the index in the words, converted the range to binary, extra three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, included 3 zeros to the 8 digits from the binary and acquired 00000010011 which translates to 19 in https://wiishlist.com/story19511245/the-basic-principles-of-bip39-passphrase-generator