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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development and implementation of the Co-Branded Career Center as described in Section 2; and 7.3.3. ***** in consideration of the design, development and implementation of the Co-Branded Equipment Listings Site as described in Section 2. 7.4. Revenue Sharing. After PaperExchange has generated PaperExchange Revenue equal to *****, PaperExchange shall pay an amount equal to ***** of the PaperExchange Revenue to VerticalNet; provided, however, that if, in any given calendar year, VerticalNet receives ***** pursuant to this Section 7.4 [Revenue Sharing], the percentage of PaperExchange Revenue that PaperExchange shall pay to VerticalNet for the remainder of such calendar year shall be reduced to *****; and provided further, however, that if, in any given calendar year, VerticalNet receives * Confidential Treatment Requested: material has been omitted and filed separately with the Commission. 12 ***** in the aggregate pursuant to this Section 7.4 [Revenue Sharing], the percentage of PaperExchange Revenue that PaperExchange shall pay to VerticalNet for the remainder of such calendar year shall be reduced to *****. 7.5. Payment Terms. Each party shall provide the other party with all amounts due under this Agreement for the prior calendar quarter within 30 days after the end of each calendar quarter during the Term. Each payment shall be accompanied by a statement detailing the amount of applicable gross revenue received, the calculation of the amount due to the other party and the amount of the payment accompanying such statement. All payments due to either party hereunder shall be made in immediately available U.S. funds, without set-off or counterclaim, free and clear of (and without deduction for or grossed up for, as applicable), any taxes, duties, charges, withholdings, restrictions or conditions of any nature imposed or levied by any governmental taxing or other authority. 7.6. Taxes. All payments required under this Agreement are exclusive of federal, state, local and foreign taxes, duties, tariffs, levies and similar assessments. When applicable, such taxes shall appear as separate items on a party's invoice or statement of the other party. Payment of such taxes or charges shall be the responsibility of the party whose obligation it is under this Agreement to make the payment in respect of which such taxes are assessed, excluding any taxes based upon the other party's net income. In lieu thereof, a party shall provide the other party with a tax or levy exemption certificate acceptable to the taxing or levying authority. 7.7. Audits. During the 18-month period following the payment by one party of any amount due under this Agreement to the other party, the party receiving Source: PAPEREXCHANGE COM INC, S-1/A, 3/22/2000 payment (the "Auditing Party") shall have the right to have an independent third party (the "Auditor") audit the financial records of the other party (the "Audited Party") relating to such payment to verify the accuracy of the Audited Party's financial records in order to verify the amount of the payments owed and/or paid. The Auditing Party may cause the Auditor to perform such an audit not more than once in any 12-month period, unless a prior audit within the past two years revealed that the amount owed by the Audited Party to the Auditing Party was underpaid in excess of 5% of the amount owed, in which case an audit may be performed no more frequently than once in any three month period. If the amount owed by the Audited Party to the Auditing Party was underpaid, the Audited Party shall pay the additional amount owed and all accrued interest thereon to the Auditing Party within 15 days of notice of such underpayment to the Audited Party. If the amount owed by' the Audited Party to the Auditing Party was underpaid in excess of 10% of the amount owed, the fees of such audit shall also be paid to the Auditing Party within 15 days of notice of such to the Audited Party. If the amount owed by the Audited Party to the Auditing Party was overpaid, the Auditing Party shall return the excess amount paid to the Auditing Party within 15 days of notice of such underpayment to the Auditing Party. The Auditing Party shall give reasonable advance written notice to the Audited Party, and each audit shall be conducted during normal business hours and in a manner that does not cause unreasonable disruption to the conduct of business by the Audited Party. 7.8. Interest. All payments not paid by the date such payments are due shall bear interest from the due date to the date payments are actually paid
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Extract the exact clause related to "Parties" from the excerpt above.