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15 36 15 37 15 38 15 39 15 40 15 41 15 42 15 43 15 44 15 45 15 46 15 47 15 48 15 49 15 50 15 51 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975

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