D Qn | Qn+1 
                                        ------|----- 
   1) 1   2) 1   3) 0   4) 0   5) 0      0 0  |  ?  
      1      1      0      0      1      0 1  |  ? 
      1      0      0      1      1      1 0  |  ? 
      1      1      1      1      0      1 1  |  ? 

1 is WRONG.

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