When {HEAD ~ the optical element} is irradiated to replicate or image the patterns of {TAIL ~ the optical element}, refined patterns can be replicated or imaged 
When { HEAD ~ the optical element } is irradiated to replicate or image the patterns of { TAIL ~ the optical element } , refined patterns can be replicated or imaged
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH