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80 8 80 9 81 0 81 1 81 2 81 3 81 4 81 5 81 6 81 7 81 8 3989 3988 3987 3986 3985 3984 3983 3982 3981 3980

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