{HEAD ~ A plurality} of annular ridges are formed inside {TAIL ~ the passageway} at the distal end of the cylinder 
{ HEAD ~ A plurality } of annular ridges are formed inside { TAIL ~ the passageway } at the distal end of the cylinder
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH