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31. What are the two figures to replace the question marks?
  34 37 32 35 30 ? ?
 

Explanation:
Numerical sequence: + 3, - 5, + 3, - 5, ... (34 + 3 = 37; 37 - 5 = 32; ...; 30 + 3 = 33; 33 - 5 = 28).