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