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54 1 54 2 54 3 54 4 54 5 54 6 54 7 54 8 54 9 55 0 55 1 55 2 55 3 55 4 55 5 55 6 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963

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