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