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7-7-4------4---7-7-4----5-5-4-----------------

------5--5---5-------5--------5--4-4-4--------

--------------------------------------------5-

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7-7-4------4---7-7-4------------2--2-2-2-4-5------------------

------5--5---5-------5--4-4-4-5---------------5---5---5---7-5-

------------------------------------------------7---7---7-----

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