Rectangles with Dominoes

Can you make a rectangle with just 2 dominoes? What about 3, 4, 5, 6, 7...?
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Can you make a rectangle with just 2 dominoes?

What about 3, 4, 5, 6, 7 ...?

Here's a rectangle made with 6 dominoes to get you started:

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Rectangles with Dominoes