C. A. 7th Cir. [Certiorari granted, 434 U. S. 1061.] Motion of Securities and Exchange Commission for leave to participate in oral argument as amicus curiae granted, and 15 additional minutes allotted for that purpose. Petitioners also allotted 15 additional minutes for oral argument. Motion of the Solicitor General for leave to participate in oral argument as amicus curiae denied.