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