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12 80 12 81 12 82 12 83 12 84 12 85 12 86 12 87 12 88 12 89 12 90 12 91 12 92 12 93 12 94 12 95 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976

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