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:
"""
foreign patents or mask work or copyright registrations covering the Inventions assigned to the Company in Section 3.1, then Consultant hereby irrevocably designates and appoints the Company and its duly authorized officers and agents as Consultant's agent and attorney-in-fact, to act for and on Consultant's behalf to execute and file any papers and oaths and to do all other lawfully permitted acts with respect to such Inventions to further the prosecution and issuance of patents, copyright and mask work registrations with the same legal force and effect as if executed by Consultant. This power of attorney shall be deemed coupled with an interest, and shall be irrevocable. TruckThat LLC Consulting Agreement Page 3 of 7 4. Consultant Obligations. 4.1. Representations and Warranties. Consultant represents and warrants that: (a) Consultant has no agreements, relationships, or commitments to any other person or entity that conflict with the provisions of this Agreement, Consultant's obligations to the Company under this Agreement, and/or Consultant's ability to perform the Services and Consultant will not enter into any such conflicting agreement during the term of this Agreement; (b) In the course of performing the Services and providing the deliverables hereunder, neither it nor Consultant's employees or contractors will violate or infringe any proprietary rights of any third party, including, without limitation, confidential relationships, trade secrets, patents, trademarks or copyrights; (c) The Services provided shall be performed in a timely, professional and workmanlike manner of a high grade, nature, and quality, and in accordance with any deadlines agreed between Consultant and Company; and (d) Consultant has in place and/or will obtain written agreements with its employees and contractors sufficient to protect Company's Confidential Information in accordance with the terms of this Agreement and to allow Consultant to provide the assignments and licenses to intellectual property rights developed by such parties in connection with the performance of the Services. 4.2 Covenant Not to Compete. Consultant does not presently perform or intend to perform, during the term of this Agreement, consulting or other services for, or engage in or intend to engage in an employment relationship with, companies who businesses or proposed businesses in any way involve products or services which would be competitive with the Company's products or services, or those products or services proposed or in development by the Company during the term of this Agreement. 4.3 Non-Solicitation. Consultant expressly agrees that he will not, without the prior written consent of the Company, either directly or indirectly on his own behalf, or in the service or on behalf of others, solicit, divert or hire away, or attempt to solicit, divert or hire away any person employed by the Company for a period of five (5) years for any reason, and without limitation for the purpose of harming the Company or of obtaining and disseminating its trade secrets, or other proprietary and confidential information. Consultant also expressly agrees that he will not, without the prior written consent of the Company, either directly or indirectly on his own behalf, or in the service or on behalf of others, solicit, divert, or attempt to solicit or divert any customer, client, supplier or vendor of the Company for a period of five (5) years for any reason, and without limitation for the purpose of harming the Company or of obtaining and disseminating its trade secrets, or other proprietary and confidential information 4.4 Non-Circumvention. Consultant expressly agrees that he will not pursue or engage in any transaction to which he was first introduced through his consulting and/or any other business or employment relationship with the Company, or to contact directly or indirectly any party of interest related to such transactions, without the prior written consent of the Company. 5. Return of Company Materials. Upon the termination of this Agreement, or upon Company's earlier request, Consultant will immediately deliver to the Company, and will not keep in Consultant's possession, recreate, or deliver to anyone else, any and all Company property, including, but not limited to, Confidential Information, tangible embodiments of the Inventions, all devices and equipment belonging to the Company, all electronically-stored information and passwords to access such property, those records maintained pursuant to Section 3.4 and any reproductions of any of the foregoing items that Consultant may have in Consultant's possession or control. 6. Reports. Consultant agrees that Consultant will periodically keep the Company advised as to Consultant's progress in performing the Services under this Agreement. Consultant further agrees that Consultant will, as requested by the Company, prepare written reports with respect to
"""

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