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