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in various ways and that it does not matter how it is realized as long as it plays the causal role characteristic to it. As an analogy, a hard drive is defined in a functionalist manner: it performs the function of storing and retrieving digital data. This function can be realized in many different ways: being made of plastic or steel, or using magnetism or laser. Functionalists hold that something similar is true for beliefs (or mental states in general). Among the roles relevant to beliefs is their relation

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