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17 98 17 99 18 00 18 01 18 02 18 03 18 04 18 05 18 06 18 07 18 08 18 09 18 10 18 11 18 12 18 13 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966

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