--------------------0---0-2-0----------
-------2-4--2-0-2-4---4-------4-2-0----
-----4---------------------------------
-4-4-----------------------------------
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--------------------0---0-2-0----------
-------2-4--2-0-2-4---4-------4-2-0----
-----4---------------------------------
-4-4-----------------------------------
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-2-------4-2-0---0---0-------2-0-------
---4-5-4-------4-------2-4-2-----4-2-4-
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-------0-------------------------------
-0-------4-2-0-------------------------
---3-1---------------------------------
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