This excerpt taken from the AOC 8-K filed Apr 18, 2006.
SECTION 2.14. Issuance of Additional Debentures.
The Company may, subject to Article Four of this Indenture and applicable law, issue additional Debentures under this Indenture. The Debentures issued on the Closing Date and any additional Debentures subsequently issued shall be treated as a single class for all purposes under this Indenture.