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