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$R2D2$ is a robot. $R2D2$ can repair aeroplanes. No other robot can repair aeroplanes. Which of the following can be logically inferred from the above statements?

  1. $R2D2$ is a robot which can only repair aeroplanes.
  2. $R2D2$ is the only robot which can repair aeroplanes.
  3. $R2D2$ is a robot which can repair only aeroplanes.
  4. Only $R2D2$ is a robot.

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