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13 87 13 88 13 89 13 90 13 91 13 92 13 93 13 94 13 95 13 96 13 97 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979

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