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