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17 63 17 64 17 65 17 66 17 67 17 68 17 69 17 70 17 71 17 72 17 73 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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