C.A. 7th Cir. Motions of Securities Industry Assn. and Lehman Commercial Paper, Inc., for leave to file briefs as amici curiae granted. Certiorari granted, judgment vacated, and case remanded for further consideration in light of Ernst Ernst v. Hochfelder, ante, p. 185. MR. JUSTICE STEVENS took no part in the consideration or decision of this case. Reported below: 524 F. 2d 1064.