-------0/0----0/0\0---2--------0/0\0------------------------------------------
-------3/5----3/5\3---3--------3/5\3----2-------------------------------------
-------4/6----4/6\4---2----1---4/6\4----2-------------------------------------
-------0/7----0/0\0--------2---0/0\0----2-------------------------------------
-----0---------------------2--------------------------------------------------
-0h2--------------------------------------------------------------------------