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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option, be deducted from any sums due to the SEV or shall be recoverable from SEV by DCL as a debt. 21.4 To the extent to which the Maintenance Services are being provided by DCL or a third party supplier under Clause 21.3, SEV will be relieved of its obligations to provide the Maintenance Services. SEV will not be liable for the acts or omissions of DCL or the third party supplier in providing the Maintenance Services. 21.5 DCL shall permit SEV to resume delivery of the Maintenance Services once it is satisfied on reasonable grounds that SEV will be able to resume delivery of the Maintenance Services in accordance with this Agreement. 21.6 SEV shall co-operate in all reasonable respects with DCL and any third party supplier engaged by DCL under this Clause. 22. Insurance 22.1 SEV shall maintain in force (at its own expense) for the term of this agreement and for six years after its termination: 24 ***Confidential treatment requested pursuant to a request for confidential treatment filed with the Securities and Exchange Commission. Omitted portions have been filed separately with the Commission. 22.1.1 employer's liability insurance for the minimum amount of £5 million to cover injury (including death) relating to the provision of the Maintenance Services to DCL; and 22.1.2 comprehensive general liability insurance, including professional indemnity, public liability and product liability insurance, for the minimum amount of £5 million to cover injury (including death), loss and damage relating to the provision of the Maintenance Services to DCL. 22.2 The insurance policies referred to in Clause 22.1 shall be with a reputable insurer and shall not include unreasonable excesses which are unusual for this type of insurance. 22.3 Within 14 calendar days of a request by DCL, SEV shall provide evidence of the insurances which it is obliged to maintain under Clause 22.1. 23. Legal status SEV is an independent contractor and nothing in this Agreement shall be deemed to constitute a partnership or any employment relationship between the parties nor shall anything in this Agreement be deemed to constitute one party the agent of the other for any purpose. 24. Force Majeure 24.1 SEV shall not be liable for any breach of its obligations hereunder resulting from causes beyond its reasonable control including but not limited to fires, insurrection or riots, embargoes, inability to obtain supplies and raw materials due to strikes or market shortages (acknowledged by DCL) affecting the relevant third party suppliers, or regulations of any civil or military authority (an "Event of Force Majeure"). 24.2 If a default due to an Event of Force Majeure shall continue for more than eight wooks then the party not in default shall be entitled to terminate this Agreement on giving written notice to the other party. Neither party shall have any liability to the other in respect of the termination of this Agreement as a result of an Event of Force Majeure. However, any termination of this Agreement shall not affect any liability of DCL to discharge any Maintenance Charges and/or Additional Charges outstanding at that time. 25. Invalidity and Severability Each of the provisions contained in this Agreement shall be construed as independent of every other such provision, so that if any provision of this Agreement shall be found by any Court or administrative body of competent jurisdiction to be invalid or unenforceable the invalidity or unenforceability of such provision shall not affect the other provisions of this Agreement and all provisions not affected by such invalidity or unenforceability shall remain in full force and effect 25 ***Confidential treatment requested pursuant to a request for confidential treatment filed with the Securities and Exchange Commission. Omitted portions have been filed separately with the Commission. The parties hereby agree to attempt to substitute for any invalid or unenforceable provision a valid or enforceable provision that achieves to the greatest extent possible the economic, legal and commercial objectives of the invalid or unenforceable provision 26. Assignment and sub-contractors 26.1 Neither party shall be entitled to assign the benefit of this Agreement without the prior written consent of the other party nor shall such consent be unreasonably withheld. 26.2 SEV, with the consent of DCL and without incurring unnecessary expense, may sub-contract the performance of its obligations under this Agreement or any part thereof and such consent will not be unreasonably withheld. 26.3 SEV shall not engage agents or sub-contractors to provide the Maintenance Services (or any material part of the Maintenance Services) without DCL's prior consent and
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Extract the exact clause related to "Insurance" from the excerpt above.

assistant: SEV shall maintain in force (at its own expense) for the term of this agreement and for six years after its termination: