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88 0 88 1 88 2 88 3 88 4 88 5 88 6 88 7 88 8 88 9 89 0 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980

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