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 | "Look at the math problems on the right-hand pages. Slide the red square up or down until the circle on the left matches the number and color on the page. Then slide the red square left or right until the circle along the top matches the number and... |
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 | After losing his parents, an investigator and a renowned violinist, sixteen-year-old Nathan joins forces with the daughter of a family friend to carry on his father's work, which leads them through a strange mirror into another world where dark... |
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