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