There are certain words that have a low probability of being used. using possible hints from the puzzle, among other things.
"low probability" is probability, not help and you think it is "low probability" but OP doesnt think so. Yes after use "possible hints" i see billion billion billion of these sentences. What are "other things"?
Other things are what I'm trying out. Can't give away all the hints
Also, a few billion is nothing and quite easy to test for brain wallets.