I took the index with the words, converted the number to binary, included three zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, extra a few zeros towards the eight digits with the binary and acquired 00000010011 which translates to 19 in https://bookmarksknot.com/story20494518/not-known-factual-statements-about-bip39-explained