---------------------------------
-1-0-------0-----1-0-------0-----
-----2-1-2-----------2-1-2-------
-------------2---------------2---
---------------------------------
---------------------------------
---------------------------------
---------------------------------
-------------0-0-2-0-------------
-0-2-3-3-2-3---------3-2-0-2-----
---------------------------------
---------------------------------
---------------------------------
---------------------------------
-------------0-0-2-0-------------
-0-2-3-3-2-3---------3-2-0-------
---------------------------3-----
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