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37 12 37 13 37 14 37 15 37 16 37 17 37 18 37 19 37 20 37 21 37 22 37 23 37 24 37 25 37 26 37 27 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963

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