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12. Which two letters come next?
  Y R T M O ? ?
 

Explanation:
There are two alternating sequence. The first sequence begins with a letter to Y, the second sequence begins with the letter R. In both sequences, each time subtracted 5. (T = Y - 5; M = R - 5; ...; H = M - 5; J = O - 5). Using the alphabetical order of the letters.