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Three intersecting circles with one embedded in another.

The puzzle's name is taken from the famous russian doll. The scheme was invented by Andrei Erashkevich but Mr. Andreev implemented it. It consists of three circles which rotate three-, four- or fivefold. Despite these differences it is a doctrinaire puzzle. This puzzle was a participant in the design competition of the International Puzzle Party 2019 in Kanazawa.



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