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15 61 15 62 15 63 15 64 15 65 15 66 15 67 15 68 15 69 15 70 15 71 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978

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