The Secretary shall make no loan or guarantee of a loan under section
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(b)(1) of this title having a maturity in excess of 25 years or the useful life of the fixed assets (whichever period is shorter), including renewals and extensions; and shall make no loan or guarantee of a loan under section
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(b)(2) of this title having a maturity in excess of 10 years, including extensions and renewals. Such limitations on maturities shall not, however, apply—