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