I took the index from the words, converted the range to binary, included 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, added three zeros into the eight digits with the binary and acquired 00000010011 which translates to 19 in https://bookmarkoffire.com/story18781753/not-known-factual-statements-about-bip39-explained