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98 7 98 8 98 9 99 0 99 1 99 2 99 3 99 4 99 5 99 6 99 7 99 8 99 9 10 00 10 01 10 02 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959 1958

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