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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given, whether or not the Holders or Beneficial Owners receive this notice. Terms used herein and not otherwise defined will have the meanings given to such terms in the Supplement. Dated: [NAME], as Remarketing Agent By: Name: Title: Cc: [●] Nuveen AMT-Free Municipal Credit Income Fund Exhibit D - Form of Retention Notice NUVEEN AMT-FREE MUNICIPAL CREDIT INCOME FUND (NVG) (THE "FUND") SERIES [●] MUNIFUND PREFERRED SHARES IN THE VARIABLE RATE REMARKETED MODE ("VRRM-MFP SHARES") CUSIP No. [●]* RETENTION NOTICE TO: [●], as Remarketing Agent Further to the Remarketing Notice dated [●] (the "Remarketing Notice") all VRRM-MFP Shares will be subject to mandatory tender for purchase at a price equal to [●] (the "Purchase Price") on [●] (the "Remarketing Date"). As set forth in the Fund's Statement Establishing and Fixing the Rights and Preferences of Series [●] MuniFund Preferred Shares effective [●] (the "Statement"), as modified with respect to the Variable Rate Remarketed Mode (the Initial Mode) by the Supplement to the Statement Establishing and Fixing the Rights and Preferences of Series [●] MuniFund Preferred Shares Initially Designating the Variable Rate Remarketed Mode for the Series [●] MuniFund Preferred Shares effective [●], as amended, revised or supplemented from time to time (the "Supplement"), any Beneficial Owner of a VRRM-MFP Share that is not a Tendered VRRM-MFP Share that was part of the Failed Remarketing Event to which the Remarketing Notice relates, as determined by the Remarketing Agent, may deliver written notice to the Remarketing Agent and the Calculation and Paying Agent by Electronic Means at least three Business Days prior to the Remarketing Date that it wishes to retain its VRRM-MFP Shares (each such Beneficial Owner, a "Retaining Beneficial Owner"). On the Remarketing Date, the VRRM-MFP Shares held by each Retaining Beneficial Owner will be subject to mandatory tender and repurchased by the Retaining Beneficial Owner at a price equal to the Purchase Price on the Remarketing Date. For purposes of the foregoing, the undersigned Beneficial Owner of VRRM-MFP Shares hereby provides notice of its wish to retain VRRM-MFP Shares of which it is Beneficial Owner, in the following amount: [●]. The undersigned person electing to retain its VRRM-MFP Shares represents that it is the Beneficial Owner of the number of VRRM- MFP Shares set forth above, and such number constitutes all of the VRRM-MFP Shares owned by the undersigned. Terms used herein and not otherwise defined will have the meanings given to such terms in the Supplement. Dated: * NOTE: None of the Fund, the Remarketing Agent or the Calculation and Paying Agent will be responsible for the selection or use of the CUSIP Numbers selected, nor is any representation made as to its correctness indicated in any notice or as printed on any VRRM-MFP Share certificate. It is included solely as a convenience to VRRM-MFP Shareholders. [Complete applicable signature block below.] Print name of Beneficial Owner By: Name: Title: [OR] Print name of Agent Member By: Name: Title: Cc: [●] Nuveen AMT-Free Municipal Credit Income Fund
"""

Extract the exact clause related to "Notice Period To Terminate Renewal" from the excerpt above.

assistant: Not found.