Is a preliminary injunction moot because the terms of the injunction have been fully and irrevocably carried out?

Accordingly, we hold that "the question whether a preliminary injunction should have been issued here is moot, because the terms of the injunction ... have been fully and irrevocably carried out," University of Texas v. Camenisch, 451 U.S. 390, 398, 101 S.Ct. 1830, 1835, 68 L.Ed.2d 175 (1981); this case does not satisfy the "capable of repetition, yet evading review" exception to the mootness doctrine; and to render an opinion on the merits of this case would violate the well-settled rule against issuing advisory opinions.