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