system: You are a legal assistant. Answer concisely and accurately. When legal text is provided, rely on it and do not invent facts.

user: Read the legal provision and list the applicable contract clause categories. Provision: Neither this Agreement nor any other Loan Document nor any provision hereof or thereof may be waived, amended or modified except (x) pursuant to an Increased Commitment Supplement executed in accordance with the terms and conditions of Section 2.21 which only needs to be signed by the Borrowers, the Administrative Agent and the Lenders increasing or providing new Revolving Commitments thereunder and (y) in the case of this Agreement and any circumstance other than as described in clause (x), pursuant to an agreement or agreements in writing entered into by IHS, the Borrowers and the Required Lenders or, in the case of any other Loan Document, pursuant to an agreement or agreements in writing entered into by the Administrative Agent and the Loan Party or Loan Parties that are parties thereto, in each case with the consent of the Required Lenders; provided that no such agreement shall (i) increase the Commitment of any Lender without the written consent of such Lender, (ii) reduce the principal amount of any Loan or LC Disbursement or reduce the rate of interest thereon, or reduce any fees payable hereunder, without the written consent of each Lender affected thereby, (iii) postpone the scheduled date of payment of the principal amount of any Loan or LC Disbursement, or any interest thereon, or any fees payable hereunder, or reduce the amount of, waive or excuse any such payment, or postpone the scheduled date of expiration of any Commitment, without the written consent of each Lender affected thereby, (iv) change Section 2.18(b) , (c) , (e) , (f) or (g) in a manner that would alter the pro rata sharing of payments required thereby, without the written consent of each Lender, (v) change any of the provisions of this Section or the definition of “Required Lenders,” “Credit Party” or “Obligation” (or any term defined therein) or any other provision of any Loan Document specifying the number or percentage of Lenders (or Lenders of any Class) required to waive, amend or modify any rights thereunder or make any determination or grant any consent thereunder, without the written consent of each Lender (or each Lender of such Class, as the case may be), (vi) release any Subsidiary Loan Party from its Guarantee under the Guaranty Agreement (except as expressly provided in Section 9.10 ) or limit its liability in respect of such Guarantee, without the written consent of each Lender, or (vii) change any provisions of any Loan Document in a manner that by its terms adversely affects the rights in respect of payments due to Lenders holding Loans of any Class differently than those holding Loans of any other Class, without the written consent of Lenders holding a majority in interest of the outstanding Loans and unused Commitments of each affected Class; provided further that (A) no such agreement shall amend, modify or otherwise affect the rights or duties of the Administrative Agent, the Issuing Bank, any Available Currency Lender, any Canadian Currency Lender or the Swingline Lender without the prior written consent of the Administrative Agent, the Issuing Bank, such Available Currency Lender, such Canadian Currency Lender or the Swingline Lender, as the case may be, and (B) any waiver, amendment or modification of this Agreement that by its terms affects the rights or duties under this Agreement of the Revolving Lenders, the Available Currency Lenders or the Canadian Currency Lenders but not any other group of Lenders, may be effected by an agreement or agreements in writing entered into by the Borrowers and requisite percentage in interest of the affected Class of Lenders.

assistant: Amendments