I took the index in the words, converted the variety to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to convert it to binary, added three zeros on the eight digits with the binary and got 00000010011 which translates to 19 in decimal. https://bookmark-master.com/story18832630/an-unbiased-view-of-bip39-seed-phrase-github