The plaintiffs assert that sections 24-11 and 24-12 of the School Code bestow upon tenured teachers employed by the Association the right to "bump" nontenured or less tenured teachers in the member school districts. Two prior cases closely resemble the facts in the present case: Aken v. Board of Control of Lake County Area Vocational Center (1992), 237 Ill. App.3d 97, and Koppi v. Board of Control of Whiteside Area Vocational Center (1985), 133 Ill. App.3d 591. In both Aken and Koppi, the plaintiff teachers were employed in contractual continued service by a cooperative vocational educational program.