I took the index of your words, transformed the selection to binary, added 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, extra three zeros into the 8 digits with the binary and acquired 00000010011 which translates to 19 in decimal. https://socialrus.com/story18353747/a-review-of-bip39-passphrase