In {HEAD ~ the exemplary embodiment}, the tube is a nuclear fuel rod and {TAIL ~ the internal components} are fuel pellets 
In { HEAD ~ the exemplary embodiment } , the tube is a nuclear fuel rod and { TAIL ~ the internal components } are fuel pellets
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH