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6. Which two letters come next?
  W T S P O L ? ?
 

Explanation:
There are two alternating sequence. The first sequence begins with a letter to W, the second sequence begins with the letter T. In both sequences, each time subtracted 4. (S = W - 4; P = T - 4; ...; K = O - 4; H = L - 4). Using the alphabetical order of the letters.