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13 66 13 67 13 68 13 69 13 70 13 71 13 72 13 73 13 74 13 75 13 76 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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