All the worst slurs I can think of in my limited vocabulary can't even be spelled with the characters available. I suspect the opposite - they might have been chosen to avoid spelling things like that.
You either know some radioactively hot slurs, or you've just not hung out there enough. Only the "i" is missing, and a week doesn't go by that someone doesn't post it with the 1 instead. Granted, I think that one's a repost (never bothered to try to check).