Furthermore, {HEAD ~ the passageways} can have any size or {TAIL ~ shape} desired, including circular or non circular shapes 
Furthermore , { HEAD ~ the passageways } can have any size or { TAIL ~ shape } desired , including circular or non circular shapes
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH