POSNER, Circuit Judge.
The plaintiff in this long-running class action suit under ERISA asks us for leave to appeal under Fed.R.Civ.P. 23(f) from an order by the district court partially decertifying the class by eliminating some 3000 to 3500 members — a reduction of between 57 and 71 percent of the membership (we are not given data that would permit a more precise estimation). The defendant has cross-petitioned for leave to appeal; it wants to argue that the...
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