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55 7 55 8 55 9 56 0 56 1 56 2 56 3 56 4 56 5 56 6 56 7 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965

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