Assertion: sight | /r/HasProperty | system
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Source sentences:
text: Sights can be a simple set or system of markers that have to be aligned together with the target (such as iron sights on firearms), or optical devices that allow the user to see a sometimes optically enhanced (e.g. magnified) image of the target aligned in the same focus with an aiming point (e.g. telescopic sights, reflector sights and holographic sights).