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97 5 97 6 97 7 97 8 97 9 98 0 98 1 98 2 98 3 98 4 98 5 98 6 98 7 98 8 98 9 99 0 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974

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