By the term ‘substantially’ is meant that about 90 percent or more of {HEAD ~ the opening surface portion} includes {TAIL ~ less than about 5 percent polymer residue} 
includes
By the term ‘ substantially ’ is meant that about 90 percent or more of { HEAD ~ the opening surface portion } includes { TAIL ~ less than about 5 percent polymer residue }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL