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15 32 15 33 15 34 15 35 15 36 15 37 15 38 15 39 15 40 15 41 15 42 15 43 15 44 15 45 15 46 15 47 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974

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