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