In "The Hound of the Baskervilles," the pairs of archetypal roles that Holmes and Watson represent are:
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hero and sidekick - Holmes is the brilliant detective (hero) and Watson serves as his loyal friend and assistant (sidekick).
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detective and doctor - Holmes takes on the role of the detective, while Watson is a doctor, providing a medical perspective and support.
Therefore, the correct answers are "hero and sidekick" and "detective and doctor."