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