If the rule isn't there, it's not a rule.
I was just going to post again but then I figured it's really not worth it.
And let's say for argument's sake that there was a rule against "hell".
A. I'd say that's the most ridiculous rule I've ever heard, but it isn't, since in one state it is illegal to fish off of the back of a camel.
B. It was a graduation ceremony, which is not part of school so wouldn't have those rules.