I came across RealDraw Pro and thought I'd give it a try. It has a good tool called 'PushBack' that makes drawing interlocking rings easy. It kind of punches a hole through the overlapping part of the top ring so that so that ring underneath can be seen. I'm sure the tool could have other uses than that but I can't think of one right now.
Instant effects to graphics and text are easily added. It's possible to export images in various bitmap formats (transparent PNG used for the text shown on its own).
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