{HEAD ~ The illumination system} includes a light source for producing a beam of parallel light, and {TAIL ~ optics} for directing the produced beam through the telecentric lens system along the optical axis thereof, and through the hole 
includes
{ HEAD ~ The illumination system } includes a light source for producing a beam of parallel light , and { TAIL ~ optics } for directing the produced beam through the telecentric lens system along the optical axis thereof , and through the hole
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