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Fred and George each had a square cake. Both of them made two straight cuts across their cake, from edge to edge. How could it happen that Fred ended up with three pieces, while George ended up with four?

Remember that two shapes are congruent if they are the same in shape and size, even if one is flipped or turned around. For example, here are two congruent shapes:

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Cut the following shape into four congruent figures:

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