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:
"""
the avoidance of doubt, nothing in this Agreement precludes the Executive from making a protected disclosure within the meaning of Part 4A (Protected Disclosures) of the Employment Rights Act 1996. 14. INTELLECTUAL PROPERTY 14.1 For the purposes of this Agreement, the following definitions shall apply: (a) Intellectual Property Rights means: (i) copyrights, moral rights, patents, inventions, know-how, Confidential Information, database rights, brands, business names, domain names, 10 Table of Contents and rights in trademarks, service marks and designs (whether registered or unregistered); (ii) applications for registration, and the right to apply for registration, and registrations for any of the same, and any renewals, reissues, extensions, continuations or divisions thereof; (iii) rights to use such assets listed in subparagraphs (i) and (ii) under licences, consents, orders, statutes or otherwise; and (iv) all other intellectual property rights and equivalent or similar forms of protection now or hereafter existing anywhere in the world. (b) IP Materials means all documents, software, photographic or graphic works of any type, and other materials in any medium or format which are created by or on behalf of the Executive in the course of performing his obligations under this Agreement and which are protected by or relate to Intellectual Property Rights. 14.2 Any Intellectual Property Rights created by the Executive or arising in the course of his employment or his performing his obligations under this Agreement shall belong to and vest in the Company. 14.3 To the extent that ownership of Intellectual Property Rights does not vest in the Company by operation of law, the Executive hereby assigns to the Company his entire right, title and interest in all Intellectual Property Rights which arise in the course of performing his obligations under this Agreement (including all present and future copyright, and copyright revivals and extensions). This assignment shall take effect upon the creation of each of the Intellectual Property Rights but if for any reason this does not occur, he agrees that he will hold all such Intellectual Property Rights on trust for the benefit of the Company until such time as it does. 14.4 The Executive agrees to sign all documents and to do all other acts which the Company requests (at its expense) to enable the Company to enjoy the full benefit of this clause 14. This includes joining in any application, which may be made in the Company's sole name for registration of any Intellectual Property Rights (such as a patent, trademark or registered design), and assisting the Company in defending and enforcing such rights during and after the employment (at the Company's expense). 14.5 Without prejudice to the generality of clause 13 (Confidential Information), the Executive may only use the Intellectual Property Rights and IP Materials to perform his obligations under this Agreement, and shall not disclose any Intellectual Property Rights or IP Materials to any third party without the express prior written consent of the Company. 14.6 The Executive waives all moral rights in IP Materials to which he may otherwise be entitled under the law of any relevant jurisdiction and which cannot be vested or assigned pursuant to sub clause 14.2 or 14.3. To the extent that any moral rights cannot be waived under the laws of any relevant jurisdiction, the Executive agrees that he will not enforce such rights. 14.7 The Executive shall promptly transfer to the Company all IP Materials in his possession or under his control as at the Termination Date, or at any time when the Company requests. No copies or other record of any IP Materials may be retained by the Executive except with the prior written consent of the Company. 14.8 The Executive understands and accepts that the remuneration and benefits provided to him by the Company in accordance with this Agreement constitute sufficient consideration to the Executive for the performance of his obligations under this clause 14 including, for the avoidance of doubt, the waiver of or covenant not to assert any moral rights that he may have. 14.9 This clause 14, and the rights and obligations of the parties contained herein, shall survive expiry of this Agreement, or its termination, for any reason. 11 Table of Contents 15. TERMINATION OF EMPLOYMENT 15.1 The Appointment may be terminated by either party giving the other at least 12 months' notice in writing. 15.2 The Company may in its sole and absolute discretion (whether or not any notice of termination has been given under sub clause 15.1) terminate this Agreement at any time and with immediate effect
"""

Extract the exact clause related to "Expiration Date" from the excerpt above.

assistant: The Appointment may be terminated by either party giving the other at least 12 months' notice in writing.