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15 23 15 24 15 25 15 26 15 27 15 28 15 29 15 30 15 31 15 32 15 33 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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