Puzzle 17: Box of 2 or 3

Here’s a small practice puzzle for one of the new (to me) types at next weekend’s Japanese round of the puzzle GP.


Rules Group some circles into boxes, such that each box contains two or three circles, such that all circles within a box are connected by edges within that box, and such that edges don’t connect circles that belong to different boxes of the same size. Furthermore, all black circles must be boxed.

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