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-------------2-----------------2---
-----------2---2-------------2---2-
-2-4-2-4-2---------2-4-2-4-2-------
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-3-2-----2-------------------2-2---
-----4-4---4-2-2-1-1---1-2-4-------
---------------------4-------------
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-3-2-----2-------------------------
-----4-4---4-2-2-1-1---1-2-2-2-2-2-
---------------------4-------------
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