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View Geometry Puzzle   (Geom004)
Make a square from 4 pieces of cardboard
Four pieces of cardboards are on a table. The length and the width are marked on each cardboard. Can you make a perfect square using these cardboards? You must put at least 2 cardboards side by side.

Warning: This puzzle might be tricky.
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Hint: Each cardboard has at least one side with the length of one unit.
Difficulty level = 2