I took the index in the words, transformed the variety to binary, included three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to convert it to binary, included three zeros for the 8 digits with the binary and got 00000010011 which translates to 19 in decimal. https://hubwebsites.com/story20121469/invalid-bip39-phrase-things-to-know-before-you-buy