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79 7 79 8 79 9 80 0 80 1 80 2 80 3 80 4 80 5 80 6 80 7 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967

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