They use mirrors and lenses to reflect and refract light and form images.
(They; use; mirrors and lenses; to reflect and refract light and form images) Context(They use,List([0, 8))):(They; use mirrors and lenses to refract; light and form images)
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They They
use use mirrors and lenses to refract
mirrors and lenses to reflect and refract light and form images
light and form images