{HEAD ~ The random access memory} provides realtime access for recording and playing back video from and to {TAIL ~ a video source} 
{ HEAD ~ The random access memory } provides realtime access for recording and playing back video from and to { TAIL ~ a video source }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL