C. A. 5th Cir. [Certiorari granted, 441 U. S. 942.] Motion of Consumers Union of the United States, Inc., for leave to file a brief as amicus curiae granted. Motion of the Solicitor General for leave to participate in oral argument as amicus curiae granted. Ten additional minutes allotted for oral argument and the time is allocated as follows: Petitioners, 20 minutes; Solicitor General, 15 minutes; and respondents, 35 minutes.