{HEAD ~ An FDMA method} allows a number of frequency channels to be used within {TAIL ~ the various frequency bands} 
{ HEAD ~ An FDMA method } allows a number of frequency channels to be used within { TAIL ~ the various frequency bands }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL