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15 50 15 51 15 52 15 53 15 54 15 55 15 56 15 57 15 58 15 59 15 60 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964

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