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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not apply Prepaid Transportation Credits on differing types of Products; i.e, a Shipper may not use Prepaid Transportation Credits received for butane service on condensate, natural gasoline, or diluent service, or vice versa. Condensate, natural gasoline, and diluent are interchangeable from a volume commitment standpoint and shipping a total volume of any one or combination of these Products will be applied towards the Quarterly Volume Commitment. Should MPL proceed with butane service, Shipper will also have the opportunity to fulfill its Quarterly Volume Commitment on a calendar quarter basis for butane service, separate from condensate, natural gasoline, and diluent service. 3.9 If, following the binding open season and prior to the in-service date of the Tariff, MPL determines that it has available capacity not subscribed to during the binding open season, not to exceed 90% of Project Capacity ("Unsubscribed Capacity"), to the extent permitted by Governmental Authority; MPL will provide Shipper the right to increase its Quarterly Volume Commitment as submitted on its Capacity Request Form on Exhibit C. MPL will provide at least sixty (60) days' advance written notice, simultaneously, to all shippers (including Shipper) who have executed a transportation service agreement during the binding open season of the availability and volume of Unsubscribed Capacity for additional volume commitments (the "Additional Volume Commitments"). No later than thirty (30) days following the date of MPL's written notice, Shipper must provide MPL with a written binding commitment identifying the additional volumes to be added to its Quarterly Volume Commitment ("Pre-Service Increase Request"). In the event MPL receives Pre-Service Increase Requests that are, in aggregate, less than or equal to the Unsubscribed Capacity, each shipper's volume commitment shall be increased by the volume of its Pre-Service Increase Request. In the event MPL receives Pre-Service Increase Requests that would, in aggregate, exceed the Unsubscribed Capacity, all Shippers will be allocated their Pre-Service Increases pro rata based on their then- current volume commitments. If Shipper makes a Pre-Service Increase Request, MPL shall notify Shipper of its new Quarterly Volume Commitment within thirty (30) days following receipt of Shipper's Pre-Service Increase Request, and Exhibit C shall be deemed revised to reflect Shipper's new volume commitment, which shall equal the sum of its original Capacity Request Form volume commitment and its Pre-Service Increase Request or its allocated portion thereof pursuant to this Section 3.9. If there is still Unsubscribed Capacity after shippers (including Shipper) exercise Additional Volume Commitments as set forth above, MPL may conduct a second open season to obtain additional volume commitments for any remaining Unsubscribed Capacity. 4. Transportation Charges 4.1 Shipper shall pay MPL a transportation charge for each Barrel of Product shipped under the terms of this Agreement and Exhibit C, at the rates provided for in Exhibit B, which shall be the Tariff Rates for the volume commitment on the Day of delivery of Product. 4.2 The rates in Exhibit B will be adjusted annually in accordance with the standard FERC annual oil pipeline indexing methodology in effect at the time of the escalation. There shall be no downward adjustment of the Rates in the event the annual FERC oil pipeline index rate is negative. Rates will typically be indexed during July of each year and would be first indexed in July of the year following project completion. 7 4.3 If during the term of this Agreement, MPL becomes obligated as a result of a Change in Law Event to bear Compliance Costs, MPL shall have the right to increase the Tariff Rates on the Pipeline, including Shipper's committed rate as originally executed on Exhibit B in this Agreement or to impose a surcharge on its shippers (including Shipper) to recover such Compliance Costs. If MPL determines to recover any Compliance Costs from its shippers, it will do so in a manner that is reasonable and equitable to all shippers on the Pipeline. 4.4 A "Committed Priority Shipper" will receive transportation service exempt from prorationing provisions under normal operating conditions for its contractually committed volumes, in exchange for a commitment to transport (or pay for) those volumes, pursuant to the terms of this Agreement executed during the open season process. The rates vary depending upon project options, but in all instances will be $0.01 per barrel above the rates for uncommitted service for the same origin and destination points. A Committed Priority Shipper will have the same rates as the Committed Non-Priority Shipper (as defined below), unless the system in under prorationing. When under prorationing, the Committed Priority Shipper's rate will
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Extract the exact clause related to "Minimum Commitment" from the excerpt above.

assistant: If Shipper makes a Pre-Service Increase Request, MPL shall notify Shipper of its new Quarterly Volume Commitment within thirty (30) days following receipt of Shipper's Pre-Service Increase Request, and Exhibit C shall be deemed revised to reflect Shipper's new volume commitment, which shall equal the sum of its original Capacity Request Form volume commitment and its Pre-Service Increase Request or its allocated portion thereof pursuant to this Section 3.9.