I took the index on the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to convert it to binary, extra a few zeros to the 8 digits from the binary and got 00000010011 which interprets to 19 in https://totalbookmarking.com/story18868314/a-review-of-bip39-phrase-list