swrl rule specify individual that is not part of class

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I can't find a solution to this swrl rule. let's say I have a class named 'AmericanCity', and a class named 'CanadianCity', and I have a 3rd class named 'NotAmerican'.. how can I say that if an individual x doesn't belong to the AmericanCity class, then it is NotAmerican?

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