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Perceptual Puzzle #26- Squaring Off -

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The image below shows 20 matchsticks that form a total of five squares (one large 3 x 3 square and four small 1 x 1 squares).

Puzzle Image

What's the fewest number of matchsticks that need to be moved to have a total of seven squares (instead of five squares)?

Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?