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I'm creating a mock computer screen where when you press certain letters, an image will show on screen. I want it so the letters can be pressed at random and not in a set order. So if I press the 's' key an image will show, if I press 'r' another image will show on top of 's' image. But if I press 's' again, I want the 's' image to be on top again. How can I accomplish this?