| http://www.w3.org/ns/prov#value | - (f) of this title if such insurance or modification is to be made in connection with a guarantee, as authorized pursuant to section 1721 of this title, of a trust certificate or other security which is exempt from Federal taxation or which is to be used to collateralize obligations which are so exempt, except that the Secretary shall not refuse to insure such a mortgage or approve such a modificat
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