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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to AT&T's obligation to reimburse or indemnify Vendor as set forth in Subsection (c) or (d) below, respectively, Vendor's duty to indemnify, hold harmless, and defend the AT&T Indemnified Parties against any Third Party Loss extends to any Third Party Loss that may be caused or alleged to be caused in part by the negligence of any of the AT&T Indemnified Parties to the fullest extent that such indemnification is permitted by applicable Law. (b) AT&T shall promptly notify Vendor in writing of any claim, demand, suit, cause of action or legal proceeding that may give rise to a claim against Vendor for defense and indemnification under this Section 3.15. If AT&T fails to give notice, Vendor is still obligated to indemnify, hold harmless and defend the AT&T Indemnified Parties, except that Vendor is not liable for any Litigation Expense that AT&T incurs before the time when notice is given or for any Loss or Liability to the extent that Vendor can show that such delay or failure to provide notice actually and materially prejudiced it in defending against such Loss or Liability. (c) Vendor shall conduct the defense (employing one or more competent attorneys from a nationally recognized law firm), at Vendor's expense, against any claim, demand, suit or cause of action within the scope of Subsection (a) above, whether or not litigation is actually commenced or the allegations are meritorious and, upon AT&T's request, keep AT&T informed as to the progress of such defense. At its own option and expense, AT&T may employ separate counsel, including in- house counsel, to conduct the AT&T Proprietary and Confidential This Agreement and information contained therein is not for use or disclosure outside of AT&T, its Affiliates, and third party representatives, and Vendor except under written agreement by the contracting parties. 16 Source: ATN INTERNATIONAL, INC., 10-Q, 11/8/2019 Indemnified Parties' defense against such a claim. AT&T and Vendor shall cooperate in the defense of any such claim. Vendor may control the defense and settlement of such a claim, but if the settlement of a claim may have an adverse effect on any of the AT&T Indemnified Parties, then Vendor shall not settle such claim without the consent of AT&T, and AT&T shall not unreasonably withhold, condition or delay its consent. To the extent that Vendor pays any part of a judgment, award or settlement with respect to the Third Party Loss and any other expenses related to the resolution of the Third Party Loss, including costs, interest, and Attorneys' Fees, as a result of being self-insured (including any deductible) or as a result of insurance coverage being insufficient to cover the amount of the judgment, award or settlement, upon final resolution of the claim, demand, suit or cause of action, AT&T shall reimburse Vendor for the pro-rata portion of any such payment based on the AT&T Indemnified Parties' fault relative to Vendor's fault. (d) In addition to AT&T's obligation to reimburse Vendor as set forth in Subsection (c) above, AT&T shall indemnify, hold harmless and defend the Vendor Indemnified Parties against any Third Party Loss arising solely from or in connection with, resulting solely from, or relating solely to (i) the AT&T Provided Equipment furnished by AT&T or (ii) the negligent or intentionally wrongful acts or omissions of any of the AT&T Indemnified Parties under this Agreement; in each case in the same manner as set forth in Subsection (b) and in the first four sentences of Subsection (c), with the appropriate changes having been made. (e) Subject to AT&T's obligation to reimburse or indemnify Vendor as set forth in Subsection (c) and (d) above, respectively, Vendor shall bring no claim or action for indemnification, contribution, or subrogation against any of the AT&T Indemnified Parties nor shall Vendor implead any of them in any action brought by another, based on injury to the person or death arising out or relating to Vendor's performance under this Agreement. If, through any such action, Vendor ever acquires a Lien on a judgment against any of the AT&T Indemnified Parties, then Vendor shall assign such Lien to AT&T. Vendor waives any immunity from indemnification (only with respect to the AT&T Indemnified Parties) that Vendor may hold, by virtue of Vendor's compliance with its workers' compensation obligations in any jurisdiction, even if such immunity arises under the constitution or statutes of such jurisdiction. (f) Notwithstanding anything to the contrary contained in this Section, the Parties intend that any amount for which any of the AT&T Indemnified Parties
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Extract the exact clause related to "Parties" from the excerpt above.

assistant: AT&T