{HEAD ~ An illumination source} is provided for illuminating {TAIL ~ four spaced apart inspection regions} which are disposed about an inspection window 
is provided for illuminating
{ HEAD ~ An illumination source } is provided for illuminating { TAIL ~ four spaced apart inspection regions } which are disposed about an inspection window
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH