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Consider the following code and resulting image:
Graphics[{Red, Disk[{0.9, 0}], Blue, Disk[{-0.9, 0}], Purple, Disk[{0, 1.5}]}]
At the moment, the blue disk is on top of the red disk and the purple disk is on top of both the red and blue ones. Is there a way to plot these disks such that the bl...