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Insurance and Insurance-Related Services Rendered to Corporate and Other Commercial Clients-Namely, the Underwriting of Residential and Commercial Mortgage-Guaranty Insurance, Rent Guaranty Insurance, Credit Insurance, Surety Insurance, and Casualty Insurance; Administrative and Services Rendered to Participants in Insurance Trusts; and Insurance-Agency Services Rendered to Financial Institutions; and Administrative Services Rendered to Financial Institutions-Namely, Management Services in Connection with Mortgage Revenue Bond Issues