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15 45 15 46 15 47 15 48 15 49 15 50 15 51 15 52 15 53 15 54 15 55 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982

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