But switches can make logic arrays. In particular with relay logic. An example on a CNC machine could be a series of switches (axis limit switches) in series, with a parallel set of contacts on a manual override switch (which would also limit axis speeds to a minimum to allow you to move the axis with problems away from the limit switch.
And for normal automotive applications, there are multiple door switches in parallel to control the dome light -- and those are in series with a master switch which often has three positions:
1) Dome light *always* off.2) Dome light switched by door switches. Any single door, or any combination of doors open turns on the light, otherwise it is off.
3) Dome light *always* on.So -- they can reasonably be referred to as being in series-parallel combinations.
Enjoy, DoN.