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12 13 12 14 12 15 12 16 12 17 12 18 12 19 12 20 12 21 12 22 12 23 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962

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