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20 7 20 8 20 9 21 0 21 1 21 2 21 3 21 4 21 5 21 6 21 7 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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