--------------5-5-------------5-5--------------5--5--3--3--------------------------
--3--3--3--3-------5--5--5--5------0--0--0--0--------------------------------------
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----7-------7------7------7------7------7--------7------7--------------------------
------7-------7--5---7--5---7------5------5---5----5------5------------------------
--5------5---------------------7------7---------------7----------------------------
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