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13 54 13 55 13 56 13 57 13 58 13 59 13 60 13 61 13 62 13 63 13 64 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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