Rules: Divide the grid into some regions formed of adjacent squares, with using dominoes (1×2 black cells). Dominoes cannot overlap, or touch each other from the sides. Each region should contain same letters.

Background: I met this puzzle type for the first time in JPC 2010. That one was open for international participation, so you can find instructions in English, published by Yuhei Kusui.

– Edit: The inventor of the puzzle is Naoki Inaba. Source of information: Takeya Saikachi


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