{HEAD ~ Terminal} 501 1 is an example of {TAIL ~ such a terminal}, as depicted in FIG 5 
{ HEAD ~ Terminal } 501 1 is an example of { TAIL ~ such a terminal } , as depicted in FIG 5
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH