To this end, {TAIL ~ the plug in assembly} is sufficiently transparent and translucent for {HEAD ~ the light wavelength} of the light used for curing 
To this end , { TAIL ~ the plug in assembly } is sufficiently transparent and translucent for { HEAD ~ the light wavelength } of the light used for curing
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH