{HEAD ~ a voltage regulator}, selectively enabled and disabled in {TAIL ~ response} to a control input, a pair of voltage monitors, 
selectively disabled in
{ HEAD ~ a voltage regulator } , selectively enabled and disabled in { TAIL ~ response } to a control input , a pair of voltage monitors ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH