Moody's investment grade ratings in order from the highest to the lowest are: Aaa, Aa1, Aa2, Aa3, A1, A2, A3, Baa1, Baa2 and Baa3. 

Moody's non-investment grade ratings in order from the highest to the lowest are Ba1, Ba2, Ba3, B1, B2, B3, Caa1, Caa2, Caa3, Ca and C. 

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