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