Let U = {x $$\mid$$ x is a natural number $$\leq$$ 20}. Define
A = {x $$\mid$$ x $$\in$$ U and x is a prime number},
B = {x $$\mid$$ x $$\in$$ U and x is an even number},
and C = {x $$\mid$$ x $$\in$$ U and x is a multiple of 3 }. Then $$(A \cup B) \cap C$$ =
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