intro
1)-------6-----7~9------9-------------------------------10----10--10--12--9-------------------
2)-------5-----------------7------7------10---------------9--------------------------12--10-10--
3)-------6-----------------7------------------------9-------------------------------------------------
4)-------5-----------------9---------------------------------------------------------------------------
5)------------------------------------------------------------------------------------------------------
6)------------------------------------------------------------------------------------------------------
---------------------------------------10--12--13------------13-----------
----------------------10-----12--------------------------12----------------
---------------10------------------------------------------------------------
------12---------------------------------------------------------------------
-------------------------------------------------------------------------------
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