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