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31 90 1 31 90 2 31 90 3 31 90 4 31 90 5 31 90 6 31 90 7 31 90 8 31 90 9 31 91 0 31 91 1 13865 13864 13863 13862 13861 13860 13859 13858 13857 13856

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