{HEAD ~ The filament cathodes} mounted in {TAIL ~ a fluorescent display tube} can reduce the power consumption of the fluorescent display tube 
mounted in
{ HEAD ~ The filament cathodes } mounted in { TAIL ~ a fluorescent display tube } can reduce the power consumption of the fluorescent display tube
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH