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13 35 13 36 13 37 13 38 13 39 13 40 13 41 13 42 13 43 13 44 13 45 13 46 13 47 13 48 13 49 13 50 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976

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