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15 81 15 82 15 83 15 84 15 85 15 86 15 87 15 88 15 89 15 90 15 91 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982

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