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77 00 77 01 77 02 77 03 77 04 77 05 77 06 77 07 77 08 77 09 77 10 7770 7769 7768 7767 7766 7765 7764 7763 7762 7761

= Free Coordinate    = Occupied(Single Region)     = Occupied (Var Region)     = Center of the grid