The shape and {HEAD ~ materials} of interior 16 may reflect and direct the sanitizing agent onto {TAIL ~ the doorknob} 
The shape and { HEAD ~ materials } of interior 16 may reflect and direct the sanitizing agent onto { TAIL ~ the doorknob }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL