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how to solve this question

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total  15 Clock Pulses are required.

CLK   Q3 Q2 Q1 Q0
    0 0 0 0
1 1 1 0 0 0
2 0 0 1 0 0
3 1 1 0 1 0
4 0 0 1 0 1
5 0 0 0 1 0
6 1 1 0 0 1
7 1 1 1 0 0
8 0 0 1 1 0
9 1 1 0 1 1
10 1 1 1 0 1
11 1 1 1 1 0
12 0 0 1 1 1
13 0 0 0 1 1
14 0 0 0 0 1
15 0 0 0 0 0
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Answer is 15 

Q3 next = QXNOR Q0 

Q2 next = Q3

Q1 next = Q2

Q0 next = Q1

The shifting will be done in this sequence

0->8->4->10->5->2->9->12->6->11->13->14->7->3->1->0

Thus a total of 15 clock pulses required

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