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Title: Have to return it.
Review: It is poorly designed. The answer is not clear to see when the button is pushed. Even you can read the answer, it can be easily hidden by the finger. The question (A x B) are painted on top of the button, and it can be easily worn out. I can't believe a product of such a poor design can be put for sale. It is already 2011! I have to return it.
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