By unbounded is meant that {HEAD ~ the adhesive clusters} do not include {TAIL ~ any applied linear boundary} or perimeter of adhesive defining the cluster area 
not include
By unbounded is meant that { HEAD ~ the adhesive clusters } do not include { TAIL ~ any applied linear boundary } or perimeter of adhesive defining the cluster area
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH