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12 81 12 82 12 83 12 84 12 85 12 86 12 87 12 88 12 89 12 90 12 91 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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