A circult has a JK fip$-$flop and a half adder $J=K=S($of the half adder$),$ a $($of the haif adder$)=Q$ and $b($of the half adder$)=Q($f you know that $Q=1$ and the circuin is negative edge thiogered, then pleisse fird the output $0$ after $4$ clock cyciets.

$(4)$ Points$)$

$(4)$ an

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