It is assumed that the protection circuit has been operated in {HEAD ~ response} to {TAIL ~ the initializing signal b} 
It is assumed that the protection circuit has been operated in { HEAD ~ response } to { TAIL ~ the initializing signal b }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL