NEW YORK--(BUSINESS WIRE)--Fitch Ratings affirms the seniors notes issued by SLM Student Loan Trust 2005-6, SLM Student Loan Trust 2005-7, SLM Student Loan Trust 2005-8, and SLM Student Loan Trust 2006-4 at 'AAAsf'. Fitch also affirms the trusts' subordinate notes at 'Asf'. The Rating Outlook remains Stable on all notes. A full list of rating actions follows at the end of this press release. KEY RATING DRIVERS High Collateral Quality: In all trusts, the collateral consists of 100% of Federal Fa


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