Motion of petitioner Arizona Christian School Tuition Organi*285zation for divided argument denied. Motion of petitioner Gale Garriott and the Acting Solicitor General for leave to allow the Acting Solicitor General to participate in oral argument as amicus curiae and for divided argument granted, and the time is to be divided as follows: 15 minutes for petitioner Gale Garriott, and 15 minutes for the United States.