{HEAD ~ The spool housing} holds a spool of dental floss and dispenses {TAIL ~ an exposed portion} of floss through an output port above the base 
{ HEAD ~ The spool housing } holds a spool of dental floss and dispenses { TAIL ~ an exposed portion } of floss through an output port above the base
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH