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ShowDesign
Write a complete program in a class named ShowDesign that uses the DrawingPanel to draw the following figure:
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The window is 200 pixels wide and 200 pixels tall. The background is white and the foreground is black. There are 20 pixels between each of the four rectangles, and the rectangles are concentric (their centers are at the same point). Use a loop to draw the repeated rectangles.
(You don't need to include any import statements at the top of your program. This class will be re-used in the next problem, so you may want to save it to a temporary file before moving on.)
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