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10 26 10 27 10 28 10 29 10 30 10 31 10 32 10 33 10 34 10 35 10 36 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981

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