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21 40 21 41 21 42 21 43 21 44 21 45 21 46 21 47 21 48 21 49 21 50 3799 3798 3797 3796 3795 3794 3793 3792 3791 3790

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