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Missing Square
Start with a chessboard and cut it in two as shown on the left in the diagram below.
Slide the top portion down to the right of the lower portion.
Place the wedge left behind on the top left into the wedge shaped gap at the
bottom right.
 The initial chessboard had 8x8=64 squares. The remaining board has 7x9=63 squares. Where did the missing square go? i
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