Can you Solve the Puzzle?

The two figures shown in the attachment are divided into four parts.
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The upper figure has two triangles, A and B, and two L-shaped areas, C and D. The lower figure has the same four parts arranged in a different order.
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Both figures have a width of 13 boxes and a height of 8 boxes. However there is also a 1-by-1 hole in the lower figure. Where did the extra space come from?
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Put your answer in the comments section.

Good luck!

-RSB