This Agreement may be executed in counterparts, each of which shall constitute an original, but all of which when taken together shall constitute a single contract (subject to Section 14 ), and shall become effective as provided in Section 14 . Delivery of an executed signature page to this Agreement by facsimile transmission shall be as effective as delivery of a manually executed counterpart of this Agreement. This Agreement constitutes the entire agreement among the parties hereto regarding the subject matters hereof and supersedes all prior agreements and understandings, oral or written, regarding such subject matter.