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12 51 12 52 12 53 12 54 12 55 12 56 12 57 12 58 12 59 12 60 12 61 12 62 12 63 12 64 12 65 12 66 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970

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