{TAIL ~ The system} 4 in which {HEAD ~ the means} for providing a test signal is a video signal storage and retrieval system 
in
{ TAIL ~ The system } 4 in which { HEAD ~ the means } for providing a test signal is a video signal storage and retrieval system
TAIL TAIL TAIL TAIL TAIL TAIL OTH REL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH