目录写在前面CombinationalLogicBasicGatesWireGNDNORAnothergateTwogatesMorelogicgates7420chipsTruthtableTwobitequalitySimplecircuitASimplecircuitBCombinecircuitsAandBRingorvibrateThermostat3bitpopulationcountGatesandvectorsEvenlongervectorsMultiplexers2to1mux2to1busmux9to1mux256to1mux256to14bitmuxArithmetic