{HEAD ~ The improvement} comprises means for locating a target with respect to the generation subsystem and {TAIL ~ means} for locating an aiming point in the image display subsystem with respect to the image generation subsystem 
{ HEAD ~ The improvement } comprises means for locating a target with respect to the generation subsystem and { TAIL ~ means } for locating an aiming point in the image display subsystem with respect to the image generation subsystem
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