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13 48 13 49 13 50 13 51 13 52 13 53 13 54 13 55 13 56 13 57 13 58 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982

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