1. Two bit counter : X 0 0 0 0 1 1 1 1 Q1 0 0 1 1 0 0 1 1 Q0 0 1 0 1 0 1 0 1 Q'1 0 0 1 1 0 1 1 0 Q'0 0 1 0 1 1 0 1 0 D1 0 0 1 1 0 1 1 0 D0 0 1 0 1 1 0 1 0 2 . Three bit counter : X 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Q2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 Q1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Q0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Q'2 0 1 1 1 1 1 1 X 1 0 0 1 1 1 1 X Q'1 0 0 0 0 0 1 0 X 0 1 1 0 0 0 1 X Q'0 1 0 0 1 0 0 0 X 0 0 1 0 0 0 1 X D2 0 1 1 1 1 1 1 X 1 0 0 1 1 1 1 X D1 0 0 0 0 0 1 0 X 0 1 1 0 0 0 1 X D0 1 0 0 1 0 0 0 X 0 0 1 0 0 0 1 X
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