In a regional spelling contest, there are six contestants: Alex, Ben, Cathy, Dan, Eva, and Frank. Each contestant competes against every other contestant exactly once, and each contest has a clear winner with no ties. If Alex wins 4 contests, Ben wins 3 contests, Cathy wins 2 contests, Dan wins 2 contests, and Eva wins 1 contest, how many contests does Frank win? Let's think step by step and output the final answer within \boxed{}.
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