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18 35 18 36 18 37 18 38 18 39 18 40 18 41 18 42 18 43 18 44 18 45 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963

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