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:
"""
respect to a Party, that such Party shall maintain records and books of accounts in accordance with United States Generally Accepted Accounting Principles. 1.14 "Acquisition" means, with respect to a Party, a merger, acquisition (whether of all of the stock or all or substantially all of the assets of a Person or any operating or business division of a Person) or similar transaction by or with the Party, other than a Change in Control of the Party. 1.15 "Adverse Ruling" has the meaning set forth in Section 12.2.1. 1.16 "Affiliate" means, with respect to a Party, any Person that, directly or indirectly, through one (1) or more intermediaries, controls, is controlled by or is under common control with such Party. For purposes of this definition, "control" and, with correlative meanings, the terms "controlled by" and "under common control with" means (a) the possession, directly or indirectly, of the power to direct the management or policies of a Person, whether through the ownership of voting securities, by contract relating to voting rights or corporate governance, or otherwise; or (b) the ownership, directly or indirectly, of more than fifty percent (50%) of the voting securities or other ownership interest of a Person (or, with respect to a limited partnership or other similar entity, its general partner or controlling entity). The Parties acknowledge that in the case of certain entities organized under the laws of certain countries outside of the United States, the maximum percentage ownership permitted by law for a foreign investor may be less than fifty percent (50%), and that in such case such lower percentage shall be substituted in the preceding sentence, provided that such foreign investor has the power to direct the management or policies of such entity. 1.17 "Agreement" has the meaning set forth in the preamble hereto. 1.18 "Alliance Manager" has the meaning set forth in Section 2.2.5. 1.19 "Applicable Law" means federal, state, local, national and supra-national laws, statutes, rules, and regulations, including any rules, regulations, regulatory guidelines, or other requirements of the Regulatory Authorities, major national securities exchanges or major securities listing organizations, that may be in effect from time to time during the Term and applicable to a particular activity or country or other jurisdiction hereunder. 1.20 "Audit Expert" has the meaning set forth in Section 6.12. 1.21 "Bankruptcy Code" has the meaning set forth in Section 12.5.1. 1.22 "BCMA" means that specific protein known as B-cell maturation antigen or tumor necrosis factor receptor superfamily member 17 (TNFRSF17) or CD269 in addition to any other known aliases [***]. - 2 - Source: HARPOON THERAPEUTICS, INC., 10-K, 3/12/2020 1.23 "Biosimilar Application" has the meaning set forth in Section 7.3.3. 1.24 "Biosimilar Product" means, with respect to a particular Licensed Product in a particular country, a biologic product that is (a) substantially similar to or interchangeable with such Licensed Product, such that the application for a BLA for such biologic product submitted to the applicable Regulatory Authority relies in whole or in part on a prior BLA granted to such Licensed Product (including any application for such biological product submitted under Section 351(k) of the PHSA or successor law, or other analogous Applicable Law, citing the Licensed Product as the reference product), or (b) determined by the applicable Regulatory Authority to be interchangeable with such Licensed Product, as set forth at 42 U.S.C. § 262(k)(4) or successor law, or other analogous Applicable Law outside of the United States. A biological product licensed under the same BLA as the Licensed Product will not constitute a Biosimilar Product. 1.25 "BLA" has the meaning set forth in the definition of "Drug Approval Application." 1.26 "Board of Directors" has the meaning set forth in the definition of "Change in Control." 1.27 "Breaching Party" has the meaning set forth in Section 12.2.1. 1.28 "Business Day" means a day other than a Saturday or Sunday on which banking institutions in New York, New York are open for business. 1.29 "Calendar Quarter" means each successive period of three (3) calendar months commencing on January 1, April 1, July 1 and October 1, except that the first Calendar Quarter of the Term shall commence on the Effective Date and end on the day immediately prior to the first to occur of January 1, April 1, July 1 or October 1 after the Effective Date, and the last Calendar Quarter shall end on the last day of the Term. 1.30 "Calendar Year" means each successive period of twelve (12) calendar months commencing on January 1
"""

Extract the exact clause related to "Irrevocable Or Perpetual License" from the excerpt above.