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15 31 15 32 15 33 15 34 15 35 15 36 15 37 15 38 15 39 15 40 15 41 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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