{HEAD ~ The combination} of {TAIL ~ the cap} and connecting sections is inserted into the hollow which is provided with an opening through its cover 
of
{ HEAD ~ The combination } of { TAIL ~ the cap } and connecting sections is inserted into the hollow which is provided with an opening through its cover
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH