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10 56 10 57 10 58 10 59 10 60 10 61 10 62 10 63 10 64 10 65 10 66 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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