The ribbon has {TAIL ~ a small thickness} to prevent obstruction of {HEAD ~ the elements} bordering the top flange and the upper surface of the top flange 
The ribbon has { TAIL ~ a small thickness } to prevent obstruction of { HEAD ~ the elements } bordering the top flange and the upper surface of the top flange
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH