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:
"""
liable under this Agreement by reason of any damages, failure or delays in the performance of its obligations under such Agreement (except for the payment of money) on account of any cause beyond the reasonable control of such Party, such as fire, explosion, power failures, pest damage, lightning or power surges, strikes or labor disputes, water, war, civil disturbances, terrorism, acts of civil or military authorities, inability to secure raw materials, transportation facilities, fuel or energy shortages, performance or availability of communications services or networks and network facilities failures of any suppliers or service providers, or other causes beyond the Party's reasonable control. (h) Neither Party may assign (voluntarily, by operation of law, or otherwise) this Agreement or any rights or obligations under this Agreement without the other Party's prior written consent, which shall not be unreasonably withheld, provided however, that either Party may assign this Agreement without approval or consent to any affiliate or purchaser of all or substantially all of said Party's assets related to the subject matter of this Agreement or to any successor by way of merger, stock sale, consolidation or similar transaction. Any attempted assignment other than in accordance herewith will be void. Subject to the foregoing, the Agreement will bind and inure to the benefit of the Parties and their respective successors and permitted assigns. The Agreement completely and exclusively states the agreement of the Parties regarding its subject matter. This Agreement supersedes, and its terms govern, all prior proposals, agreements, or other communications between the parties, oral or written, regarding its subject matter. (i) This Agreement is intended for the sole and exclusive benefit of the Parties hereto, is not intended to confer any rights or benefits on any third party, and only the Parties may enforce such Agreement. This Agreement shall be binding on both Parties when signed on behalf of each Party, and may be signed in one or more counterparts, each of which shall be deemed to be an original and both of which when taken together will constitute one and the same agreement. Fax or electronically scanned copies of such executed documents may be used in lieu of the originals for any purpose. IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be executed by their duly authorized representatives as of the dates written below. Kubient Signature: /s/ Paul Roberts By: Paul Roberts Its: CFO Date: 2-6-2020 Customer Signature: /s/ Paul Caluori By: Paul Caluori Its: VP, Global Products Date: 02-05-2020
"""

Extract the exact clause related to "Covenant Not To Sue" from the excerpt above.

assistant: Not found.