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![PDF] Power Efficient Design of 4 Bit Asynchronous Up Counter Using D Flip Flop | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/0db871482e1fca69c779fb718f2b9c1fbce3edb3/2-Figure4-1.png "PDF] Power Efficient Design of 4 Bit Asynchronous Up Counter Using D Flip Flop | Semantic Scholar")