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15 56 15 57 15 58 15 59 15 60 15 61 15 62 15 63 15 64 15 65 15 66 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960

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