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Simple scenario: Draw a filled circle of some size, then draw another filled circle of a smaller size, and center the smaller circle inside the bigger circle. You now have a "stylized" letter O, except for the center part - which is filled.

My question is: How do I make the outer union of the two circles filled, while the center part is clear, i.e. transparent? I can set the opacity of either circle, but it doesn't do what I want. I want the smaller circle to essentially "cut out" the inner part of the bigger circle.