I am brand new to circuits & was hoping someone could answer these two very simple questions regarding Logisim. In Logisim; is A0 the LSB or the MSB for the above IC? Also, tell me Y5 refers to A2 A1' A0 & Y2 refers to A2' A1 A0'. Also, is C the MSB or A the MSB in the following Logisim IC? Again, tell me D5 refers to C B' A and D4 refers to C B' A'. I'm second guessing because I've built a large counter which displays a sequence on a Hex display... and I'm only getting errors at the MUX / DEMUX points. It's also 2 AM.