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17 67 17 68 17 69 17 70 17 71 17 72 17 73 17 74 17 75 17 76 17 77 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966

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