In {HEAD ~ one modification}, {TAIL ~ the first and second jaws} 20 and 22 comprise, consist essentially of, or consist of substantially clear polycarbonate 
In { HEAD ~ one modification } , { TAIL ~ the first and second jaws } 20 and 22 comprise , consist essentially of , or consist of substantially clear polycarbonate
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH