Further, {TAIL ~ the electromagnetic radiation} can be exposed on surface 501 in the form of {HEAD ~ a pattern}  
Further , { TAIL ~ the electromagnetic radiation } can be exposed on surface 501 in the form of { HEAD ~ a pattern }
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH