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13 06 13 07 13 08 13 09 13 10 13 11 13 12 13 13 13 14 13 15 13 16 13 17 13 18 13 19 13 20 13 21 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962

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