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12 97 12 98 12 99 13 00 13 01 13 02 13 03 13 04 13 05 13 06 13 07 13 08 13 09 13 10 13 11 13 12 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959

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