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29 3 29 4 29 5 29 6 29 7 29 8 29 9 30 0 30 1 30 2 30 3 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967

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