Design a sequential circuit with two flip-flop and one input, Computer Engineering

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Design a counter modulo 4 (sequential circuit with two flip-flops and one input U) which work like that:

1. When U=0, the state of the flip-flop does not change.

2. When U=1, the state sequence is code Gray 11, 10, 00, 01 and repeat.

a. implement with D flip-flops

b. implement with J K flip-flops

c. implement with T flip-flops

Specify how initialize the initial state of the counter

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