{HEAD ~ The cylinder} comprises {TAIL ~ an open cylindrical passage} and includes a needle attached in a conventional manner at the proximal end thereof 
{ HEAD ~ The cylinder } comprises { TAIL ~ an open cylindrical passage } and includes a needle attached in a conventional manner at the proximal end thereof
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH