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