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:
"""
of [*****] corresponding to [*****] of the Stock value which is set in Exhibit 8 ("Lease of the Stock"), Clause 2.2 ; or (ii) in the event the Repairer delivers used Items to the Company as per Clause 2.2 of the Exhibit 8 ("Lease of the Stock"), the [*****] set forth in 1.1 (i) here above shall be payable from the Start Date until the date on which the last Item of the Stock is delivered. On such latter mentioned date, the Repairer will notify to the Company the exact and definitive Stock value, and the accordingly revised monthly lease payment based upon [*****] of such exact and definitive Stock value. Upon Delivery of the last Item of the Stock, the Repairer shall issue a credit equal to the difference between: a. the total amount of lease payments actually paid by the Company since the Start Date according to Clause 1.1 (i) here above,and b. the price the Company should have paid for the used Items delivered by the Repairer according to Clause 1.1 (ii) here above. 1.2 The price payable [*****] per Aircraft by the Company to the Repairer for the standard exchange Service set out in Exhibit 9 ("Spare parts standard exchange Service") is as follows (with unlimited POOL access): [*****] [*****] [*****] [*****] [*****] 1.3 The prices per airborne FH per Aircraft payable by the Company to the Repairer for the repairs and overhauls of the LRUs and the Main Elements set out in this Agreement are: 1.3.1 For LRU repair and overhaul: [*****] Confidential material redacted and filed separately with the Securities and Exchange Commission. AZUL-ATR Global Maintenance Master Agreement DS/CS-3957/14/Issue 7 Page 95/110 Source: AZUL SA, F-1/A, 3/3/2017 Execution version CONFIDENTIAL TREATMENT REQUESTED [*****] [*****] [*****] [*****] [*****] [*****] 1.3.2 For the Main Element Services as per Exhibit 11 ("Main Elements Services"): i) propellers [*****] per Aircraft): (a) For maintenance - [*****] - [*****] The above propellers maintenance provisions and availability prices are defined as a result of the following repartition related to the maintenance of the following propeller hub, actuator, transfer tube and blades composing each propeller assembly: Blades Hub Actuator Transfer Tube Adjusting Nut [*****] [*****] [*****] [*****] [*****] [*****] [*****] [*****] [*****] [*****] [*****] [*****] &bbsp; [*****] [*****] [*****] (b) For availability [*****] [*****] Confidential material redacted and filed separately with the Securities and Exchange Commission. AZUL-ATR Global Maintenance Master Agreement DS/CS-3957/14/Issue 7 Page 96/110 Source: AZUL SA, F-1/A, 3/3/2017 Execution version CONFIDENTIAL TREATMENT REQUESTED ii) left intentionally blank iii) landing gears (per shipset): For 42-500, 72-500, 72-600 landing gears: (a) For maintenance: [*****] [*****] plus (b) For availability [*****] [*****] The above landing gear maintenance provisions and availability prices are defined as a result of the following repartition related to the maintenance of the following sub-assemblies composing each landing gear assembly [*****] [*****] NLG [*****] [*****] Drag Brace [*****] [*****] MGL [*****] [*****] Side Brace [*****] [*****] Life limited parts repair or replacement will be subject to a case by case quotation. 1.3.3 Additional flat rates: Additional flat rates here under shall be applied for the following operations, as applicable: a) for [*****], a flat rate of : For [*****]: [*****] b) for [*****], a flat rate of : For [*****]: [*****] 2. Reconciliation conditions 2.1 Left intentionally blank 2.2 Price adjustment for LRUs removal rate reconciliation [*****] Confidential material redacted and filed separately with the Securities and Exchange Commission. AZUL-ATR Global Maintenance Master Agreement DS/CS-3957/14/Issue 7 Page 97/110 Source: AZUL SA, F-1/A, 3/3/2017 Execution version CONFIDENTIAL TREATMENT REQUESTED Any difference, to be measured in units and tens, between the RRR and the MRR pursuant to the conditions set out in Clause 11.1 (iii) and (iv) of the Agreement, shall be invoiced or credited, provided the Company is not in Default of any of its obligations pursuant to this Agreement, per airborne FH on the basis of: for [*****] [*****] [*****] for [*****] [*****] [*****] for [*****] [*****] [*****] [*****] In addition, at each reconciliation based on the actual flown flight hours, the Repairer shall credit back: [*****] 2.3 Early Events The Parties agree that the prices for each Service subject to Scheduled Events are based on the achievement of the applicable maintenance program(s), expressed in [*****]. In case of deviation of the Scheduled Event maintenance program parameters by a number of [*****] shall be considered an Early Event. For any Early Event, whichever the context, the Repairer shall invoice the Company an amount equal to the Lost Potential multiplied by
"""

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

assistant: Not found.