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