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12 37 12 38 12 39 12 40 12 41 12 42 12 43 12 44 12 45 12 46 12 47 12 48 12 49 12 50 12 51 12 52 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963

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