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15 11 15 12 15 13 15 14 15 15 15 16 15 17 15 18 15 19 15 20 15 21 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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