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98 4 98 5 98 6 98 7 98 8 98 9 99 0 99 1 99 2 99 3 99 4 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969

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