Design circuits with unused inputs or has a constant expression
simulate this circuit &ndash; Schematic created using CircuitLab
Figure 1. Input C is &quot;not connected&quot;.

And what about if the simplified expression is always 1 or 0 regardless of the state of these 3 inputs?




simulate this circuit
Figure 1. Always high and always low could be represented by either of the centre or right layouts above.