15. ORIGINAL AND ENTIRE AGREEMENT This Agreement may be executed in any number of counterparts, each of which shall be an original, but such counterparts shall together constitute one and the same agreement. The exchange of copies of this Agreement and of signature pages by facsimile transmission, by electronic mail in “portable document format” (“.pdf”) form, or by any other electronic means intended to preserve the original appearance of a document, or by a combination of such means, shall constitute effective execution and delivery of this Agreement. Signatures by the parties electronically transmitted shall be deemed to be original signatures for all purposes. This Agreement supersedes all other prior discussions, representations, and agreements, whether oral or written, express or implied, between the parties relating to the matters contemplated herein and constitutes the entire agreement between the parties relating to the subject matter hereof.