What is considered to be an outdated way to gain knowledge?\nOptions:\n- encyclopedia\n- television\n- head\n- library\n- book
Step-by-step reasoning process below:

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Encyclopaedia is a book or set of books giving information on many subjects or on many aspects of one subject and typically arranged alphabetically. Encyclopaedia is considered to be an outdated way to gain knowledge. The answer: encyclopedia.
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