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