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----4-0-------4-0-------5-5---5-5---5-4-3
-2-2---2-0-2-2---2-0-3-3---3-3---3-3-----x2



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----4-0-4-5-4-3-0---5-5----5-5---5-4-3
-2-2-------------3-3----3-3---3-3-----