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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tax, shipping and handling charges, and credits for returned goods and/or services. o For revenues in excess of XXXXXXXXXXXXX of all sales, excluding any and all amounts collected for sales tax, shipping and handling charges, and credits for returned goods and/or services. o For revenues in excess of XXXXXXXXXXXXXXXXXXXXXX of all sales, excluding any and all amounts collected for sales tax, shipping and handling charges, and credits for returned goods and/or services. o For revenues in excess of XXXXXXX of all sales, excluding any and all amounts collected for sales tax, shipping and handling charges, and credits for returned goods and/or services. e) Client will pay Excite its variable revenue share payments within thirty (30) days after the close of each month. 9 CONFIDENTIAL f) The sponsorship and advertising fees and variable revenue share payments are net of any agency commissions to be paid by Client. g) Client will maintain accurate records with respect to the calculation of all variable revenue share payments due under this Agreement. Once per year, the parties will review these records to verify the accuracy and appropriate accounting of all payments made pursuant to the Agreement. In addition, Excite may, upon no less than thirty (30) days prior written notice to Client, cause an independent Certified Public Accountant to inspect the records of Client reasonably related to the calculation of such payments during Client's normal business hours. The fees charged by such Certified Public Accountant in connection with the inspection will be paid by Excite unless the payments made to Excite are determined to have been less than ninety-five percent (95%) of the payments actually owed to Excite, in which case Client will be responsible for the payment of the reasonable fees for such inspection. 8. PUBLICITY Unless required by law, neither party will make any public statement, press release or other announcement relating to the terms of or existence of this Agreement without the prior written approval of the other. Such approval will not be unreasonably withheld. Notwithstanding the foregoing, the parties agree to issue an initial press release regarding the relationship between Excite and Client, the timing and wording of which will be mutually agreed upon. 9. TERM AND TERMINATION a) The term of this Agreement will begin on the Launch Date and will not end until Excite displays of a total of XXXXXXXXXXXXX impressions of Client's advertising banners and promotional placements on the Excite Site and Excite has made reasonable commercial efforts to deliver, at minimum, a goal of XXXXXXXX clickthroughs to the Client Site. Regardless of Excite's actual delivery of impressions and clickthroughs, the term of this Agreement will not be shorter than two (2) years after the display of the first of Client's advertising banners and promotional placements, subject to the termination rights set forth below. b) Sixty (60) days prior to the end of the first year after the Launch Date, Excite and Client will negotiate in good faith to establish allocated number of impressions, advertising banners and promotional placements for the second year of the term of the Agreement. 10 CONFIDENTIAL c) Excite's goal is to deliver XXXXXXXXXXXXXXXXXXXXXXXX clickthroughs to the Client Site during the fourth through sixth months (inclusive) after the Launch Date, XXXXXXXXXXXXXXXX clickthroughs to the Client Site during the seventh through ninth months (inclusive) after the Launch Date, and XXXXXXXXXXXXXXXXXXXX clickthroughs to the Client Site during the ninth through twelfth months (inclusive) after the Launch Date. d) In the event that Excite has not delivered XXXXXXXXXXXXXXXX clickthroughs to the Client Site by the end of twelve (12) months after the Launch Date, the first year of the term of the Agreement will be extended without additional sponsorship and advertising fees for up to an additional four (4) months. In the event that Excite has not delivered XXXXXXXXXXXXXXXXXXXXX clickthroughs to the Client Site by end of the additional four-month period, Client may terminate this Agreement immediately upon delivery of written notice to Excite. e) Either party may terminate this Agreement if the other party materially breaches its obligations hereunder and such breach remains uncured for thirty (30) days following the notice to the breaching party of the breach. f) All undisputed payments that have accrued prior to the termination or expiration of this Agreement will be payable in full within thirty (30) days thereof. g) The provisions of Section 12 (Confidentiality and User Data), Section 13 (Indemnity), Section 14 (Limitation of Liability) and Section 15 (Dispute Resolution) will survive any termination or expiration of this Agreement.
"""

Extract the exact clause related to "Expiration Date" from the excerpt above.

assistant: In the event that Excite has not delivered XXXXXXXXXXXXXXXX clickthroughs to the Client Site by the end of twelve (12) months after the Launch Date, the first year of the term of the Agreement will be extended without additional sponsorship and advertising fees for up to an additional four (4) months.