The gap region is sized such that a user can grasp {HEAD ~ the exposed portion} of {TAIL ~ floss} without contacting any part of the floss dispenser 
of
The gap region is sized such that a user can grasp { HEAD ~ the exposed portion } of { TAIL ~ floss } without contacting any part of the floss dispenser
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 OTH