system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
"""
1 EXHIBIT 10.26 Confidential Treatment Requested CO-BRANDING AGREEMENT This Co-Branding Agreement (this "Agreement") by and between VerticalNet, Inc., a Pennsylvania corporation having a principal place of business at 700 Dresher Road, Suite 100, Horsham, Pennsylvania, PA 19044 ("VerticalNet"), and Neoforma.com, Inc., a Delaware corporation having a principal place of business at 3255-7 Scott Boulevard, Santa Clara, CA 95054 ("Neoforma"), is dated as of November 19, 1999 (the "Effective Date"). In consideration of the mutual covenants herein, and intending to be legally bound hereby, the Parties agree as follows: 1. DEFINITIONS. 1.1 ADVERTISING shall mean any paid advertisements, links, pointers, sponsorships, buttons, banners, navigation, or any other placements or promotions or similar services or rights on a Site, but excluding Advertising that is not paid for or which is part of an overall partnering or revenue sharing arrangement and any Product Listings. 1.2 AFFILIATE shall mean, when used with reference to a Party, any individual or entity directly or indirectly controlling, controlled by or under common control with such Party. For purposes of this definition, "control" means the direct or indirect ownership of at least 50% of the outstanding voting securities of a Party, or the right to control the policy decisions of such Party. 1.3 CAREER CENTER GROSS MARGIN shall have the meaning ascribed thereto in Section 10.5.1 [CO-BRANDED CAREER CENTER]. 1.4 CO-BRANDED CAREER CENTER shall mean the Site located at an URL to be mutually agreed upon (which agreement shall not be unreasonably withheld or delayed) containing a VerticalNet Mark and a Neoforma Mark listing openings for positions and posting other career information in the medical and healthcare fields substantially in the form of the existing "Career Center" portions of the VerticalNet Medical Online Communities. 1.5 CO-BRANDED SITES shall mean the Co-Branded Career Center and the Co-Branded Training and Education Center. 1.6 CO-BRANDED TRAINING AND EDUCATION CENTER shall mean the Site located at an URL to be mutually agreed upon (which agreement shall not be unreasonably withheld or delayed) containing a VerticalNet Mark and a Neoforma Mark listing training and education offerings in the medical and healthcare fields substantially in the form of the existing "Training and Education" portions of the VerticalNet Medical Online Communities. 1.7 CONFIDENTIAL INFORMATION shall mean all proprietary and confidential information of a Party, including, without limitation, trade secrets, technical information, business information, sales information, customer and potential customer lists and identities, product sales plans, sublicense agreements, inventions, developments, discoveries, software, know-how, methods, techniques, formulae, data, processes and other trade secrets and proprietary ideas, whether or 2 not protectable under patent, trademark, copyright or other areas of law, that the other Party has access to or receives and which, if disclosed in writing, is marked as "Confidential Information," or if disclosed orally, is confirmed in writing to be "Confidential Information" within five days of such oral disclosure, but does not include information that (a) is or becomes publicly available through no fault of the receiving Party; (b) was already known to the receiving Party at the time it was disclosed to the receiving Party, as evidenced by written records of the receiving Party; (c) is independently developed by or on behalf of the receiving Party without reference or access to such information, as evidenced by written records of the receiving Party; or (d) is received from a third party who is under no obligation of confidentiality to the disclosing Party. 1.8 DEDUCTIBLES shall mean credits for claims, allowances, seller rebates or returned goods, commissions paid to any third parties, and sales, service, excise, use, value-added and other similar taxes (excluding income taxes) actually paid. 1.9 INITIAL TERM shall mean the Effective Date through the day prior to the second anniversary of the Effective Date, unless earlier terminated pursuant to Section 11. 1.10 INTELLECTUAL PROPERTY shall mean any and all trade secrets, patents, copyrights, trademarks, URLs, trade dress, brand features, know-how and similar rights of any type under the laws of any applicable governmental authority, including, without limitation, all applications and registrations relating to any of the foregoing. 1.11 INTELLECTUAL PROPERTY RIGHTS shall mean all rights in and to Intellectual Property. 1.12 LABORATORY PRODUCTS shall mean any equipment, instruments or other products used for scientific research and analysis in the field of human health care, including, but not limited to, the categories of equipment, instruments and products listed on EXHIBIT A, (i) that is (a) previously used and is being resold by or on behalf of the prior end-user purchaser or (b) previously sold but unused
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Extract the exact clause related to "Document Name" from the excerpt above.

assistant: CO-BRANDING AGREEMENT