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Don't ask for money directly. It might be a setup for a trademark claim.

How? It's only two letters, so it would be like YCombinator making a trademark claim on yc

I agree on not asking for money directly though

There are many 2 letter trademarks.

It's not 100%, just a possible risk to be aware of.

KFC is three letters and a trademark. It is a trademark not a "complete sentence mark"