Question: A sequential circuit has four outputs ( X 3 , X 2 , X 1 , X 0 ) which advance through the following repeating

A sequential circuit has four outputs (X3,X2,X1,X0) which advance through the following
repeating sequence:
X3X2X1X0: 0000->0001->0011->0111->1111->1100->0000->...
What is the minimum number of flip-flops needed to implement this circuit?

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