Motion of respondent Attorney General of California for divided argument granted. Motion of the Solicitor General for leave to participate in oral argument as amicus curiae, for enlargement of time for oral argument, and for divided argument granted; and the time is divided as follows: 40 minutes for petitioners, 15 minutes for the Union Respondents, 15 minutes for respondent Attorney General of California, and 10 minutes for the Solicitor General.