{HEAD ~ The chewing gum} of {TAIL ~ this invention} may be either sugarless or sugar containing 
of
{ HEAD ~ The chewing gum } of { TAIL ~ this invention } may be either sugarless or sugar containing
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH