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13 33 13 34 13 35 13 36 13 37 13 38 13 39 13 40 13 41 13 42 13 43 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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