{TAIL ~ The optical element} includes lenses, fθ lenses, {HEAD ~ prisms}, parallel flat plates and fly eye integrators 
{ TAIL ~ The optical element } includes lenses , fθ lenses , { HEAD ~ prisms } , parallel flat plates and fly eye integrators
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH