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80 4 80 5 80 6 80 7 80 8 80 9 81 0 81 1 81 2 81 3 81 4 3990 3989 3988 3987 3986 3985 3984 3983 3982 3981

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