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12 31 12 32 12 33 12 34 12 35 12 36 12 37 12 38 12 39 12 40 12 41 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960

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