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12 48 12 49 12 50 12 51 12 52 12 53 12 54 12 55 12 56 12 57 12 58 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963

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