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13 51 13 52 13 53 13 54 13 55 13 56 13 57 13 58 13 59 13 60 13 61 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985

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