Appellant's petition for rehearing with suggestion for rehearing en banc has been considered by the court and is granted. The opinion and judgment of this court filed on July 5, 1989, are vacated. The case is set for oral argument before the court en banc at 9:00 a.m. Tuesday, October 10, 1989, as the third case that day, in the U.S. Courthouse in St. Paul, Minnesota.