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15 41 15 42 15 43 15 44 15 45 15 46 15 47 15 48 15 49 15 50 15 51 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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