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17 91 17 92 17 93 17 94 17 95 17 96 17 97 17 98 17 99 18 00 18 01 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964

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