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13 63 13 64 13 65 13 66 13 67 13 68 13 69 13 70 13 71 13 72 13 73 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979

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