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15 51 15 52 15 53 15 54 15 55 15 56 15 57 15 58 15 59 15 60 15 61 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977

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