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15 35 15 36 15 37 15 38 15 39 15 40 15 41 15 42 15 43 15 44 15 45 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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