{HEAD ~ The system} 3 or 4 wherein {TAIL ~ said alarming means} comprises a buzzer 
wherein
{ HEAD ~ The system } 3 or 4 wherein { TAIL ~ said alarming means } comprises a buzzer
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH