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README.md

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+A stackable full adder built out of discrete CMOS pairs, with LEDs on each
+transistor's input and a flip flop on each drain (just one flip flop if
+multiple transistors have a common drain). This allows visualizing the effect
+that propagation delay has on an adder's speed. Components are generally rather
+small to save on PCB space and production costs, but are still hand-solderable.