I took the index in the words, transformed the number to binary, additional a few zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to convert it to binary, additional three zeros for the eight digits with the binary and got 00000010011 which translates to 19 https://bookmarkforest.com/story19538539/the-basic-principles-of-bip39-passphrase-generator