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13 03 13 04 13 05 13 06 13 07 13 08 13 09 13 10 13 11 13 12 13 13 13 14 13 15 13 16 13 17 13 18 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