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