{HEAD ~ The stopper} has a first end portion and {TAIL ~ a second end portion}, the first end portion being fixed to the cover 
has
{ HEAD ~ The stopper } has a first end portion and { TAIL ~ a second end portion } , the first end portion being fixed to the cover
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH