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:
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3.2, it is expressly agreed that RemainCo is not obtaining any right, title or interest in the SpinCo House Marks. 9 Section 3.3 Removal of Classes from SpinCo Marks. (a) Within sixty (60) days from the Distribution Date, SpinCo will make all necessary filings and take all necessary actions, subject to all applicable local Laws, to (i) as applicable, amend the description of goods and services to remove references to nuclear subject matter included in any existing registration for any SpinCo House Mark registered in the United States, Canada, the United Kingdom, the People's Republic of China, Romania, South Korea, Vietnam, India, Indonesia, Japan, Mexico, Norway, South Africa, Ukraine, the European Union and Argentina and (ii) as applicable, to amend or modify the description of goods and services to remove references to nuclear subject matter contained in any application pending for any SpinCo House Mark in the United States, Canada, the United Kingdom, the People's Republic of China, Romania, South Korea, Vietnam, India, Indonesia, Japan, Mexico, Norway, South Africa, Ukraine, the European Union and Argentina. Without limiting the foregoing, within sixty (60) days from the Distribution Date, SpinCo will make all necessary filings and take all necessary actions, subject to all applicable local Laws, to amend the description of goods and services to remove referenced to nuclear subject matter from the registrations and applications for SpinCo House Marks listed on Schedule 3.3. (b) Within ninety (90) days from the Distribution Date, SpinCo will make all necessary filings and take all necessary actions, subject to all applicable local Laws, to (i) as applicable, amend the description of goods and services to remove references to nuclear subject matter included in any existing registration for any SpinCo Trademarks (other than SpinCo House Marks otherwise covered by Section 3.3(a)) and (ii) as applicable, amend or modify any application pending for any SpinCo Mark (other than SpinCo House Marks otherwise covered by Section 3.3(a)) to amend the description of goods and services to remove references to nuclear subject matter contained in such application. Section 3.4 RemainCo Marks. SpinCo agrees and acknowledges that (i) as of the Date of this Agreement, as between the SpinCo Group and the RemainCo Group, all right, title and interest in and to the Trademarks set forth on Schedule 3.4 (the "RemainCo Trademarks") shall be the sole and exclusive property of the RemainCo Group and the SpinCo Group shall cease and discontinue all use of the RemainCo Marks as of the Distribution Date. Section 3.5 Duty to Avoid Confusion. The Parties confirm their belief that the likelihood of confusion will not result from their respective use of the SpinCo Marks and RemainCo Marks, including RemainCo's continuing use of the name BWX Technologies and continued use of the terms "BWX", "BWX Technologies" or "BWXT" and derivations thereof and therefrom, due to the differences in the goods and services primarily associated therewith (e.g., nuclear versus fossil fuel). In the event that either Party becomes aware of any actual confusion or mistake occurring as a result of their uses of their respective marks, the Parties agree to communicate all details of each such instance to each other, and to cooperate reasonably to take steps to abate the cause of confusion or mistake, and to prevent any such confusion or mistake from arising again. 10 ARTICLE IV SHARED LIBRARY MATERIALS Section 4.1 Shared Library Materials. RemainCo and SpinCo acknowledge and agree that the Shared Library Materials represent a collection of shared historical and foundational information related to and derived from more than fifty (50) years of research and development focused on technology and design criteria applicable to the businesses of RemainCo and SpinCo, which information, including all Know-How and Copyrights contained therein, has application to the businesses of RemainCo and SpinCo. The Shared Library Materials identified as of the Distribution Date are set forth on Schedule 4.1, which may be amended or modified upon mutual agreement of the Parties from time to time to (i) include additional Shared Library Materials discovered after the Distribution Date or (ii) to reflect the results of the allocation process contemplated in Section 4.4 below. Section 4.2 Cross-License of Shared Library Materials. The Parties acknowledge and agree that each of RemainCo and SpinCo and additional members of the RemainCo Group and SpinCo Group presently have shared access to and rights to exploit the Shared Library Materials and may have a right and interest in and to certain Shared Library Materials, including in and to Intellectual Property embodied therein. Accordingly, (i)
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Extract the exact clause related to "Ip Ownership Assignment" from the excerpt above.