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The 38 moves in the video store fall int...

The 38 moves in the video store fall into the following three categories : 10 action, 20 drama, and 18 comedy. However, some movies are classified under more than one category: 5 are both action and drama, 3 are both action and comedy, and 4 are both drama and comedy. How many action - drama - comedy movies are there?

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