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13 28 13 29 13 30 13 31 13 32 13 33 13 34 13 35 13 36 13 37 13 38 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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