4. Minimize the logic
D1 = Q1 + D + Q0N
D0 = Q0'N + Q0N' + Q1N + Q1D
OPEN = Q1Q0
if FFs do not have a reset pin then
D1 = reset'(Q1 + D + Q0N)
D0 = reset'(Q0'N + Q0N' + Q1N + Q1D)
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