------5-5----5----------5--------
---7-------------8--7------------
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---------------------------------
---------------------------------
---------------------------------
5---7------7---10----7-----------
-------8-----------------10------
---------------------------------
---------------------------------
---------------------------------
---------------------------------
----7-----7---10--9--7--5--7--5--
10-----8------------------------7
---------------------------------
---------------------------------
---------------------------------
---------------------------------
----5-5---5-7----9-10------------
-7-------------------------------
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---------------------------------
---------------------------------
---------------------------------