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On the fifth clock pulse, a 4-bit Johnson sequence is $Q_0 = 0, Q_1 = 1, Q_2 = 1,$ and $Q_3 = 1$. On the sixth clock pulse, the sequence is ________.

  1. $Q_0 = 1, Q_1 = 0, Q_2 = 0, Q_3 = 0$
  2. $Q_0 = 1, Q_1 = 1, Q_2 = 1, Q_3 = 0$
  3. $Q_0 = 0, Q_1 = 0, Q_2 = 1, Q_3 = 1$
  4. $Q_0 = 0, Q_1 = 0, Q_2 = 0, Q_3 = 1$
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Answer should be C as last Q3' = 0 which again input to Q0 in sixth cycle.
Answer:

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