A system for displaying audio content with text including a book holder and a book. The book holder identifies which book of a plurality is placed in the holder by detecting magnetic indicators in specific locations and arrangements which are unique to each book. The page of the book which a user views at any given time is identified by detection of ambient light, by detection of a number of circuit elements in parallel, by detection of progressively stacked magnetic sensors, or by microwave reflection.

 
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< Apparatus and method for educational game hoop

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> Image display system with body position compensation

> Voice synthesizing method and voice synthesizer performing the same

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