I took the index with the words, converted the variety to binary, added a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, additional three zeros towards the 8 digits with the binary and obtained 00000010011 which translates to 19 in https://getsocialpr.com/story20747627/not-known-factual-statements-about-bip39-explained