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13 31 13 32 13 33 13 34 13 35 13 36 13 37 13 38 13 39 13 40 13 41 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978

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