A control part inspects the switch to produce {TAIL ~ a condition signal} representative of one of the conditions to which {HEAD ~ the switch} is switched 
A control part inspects the switch to produce { TAIL ~ a condition signal } representative of one of the conditions to which { HEAD ~ the switch } is switched
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH