Series 2 episodes are: 'A Scandal in Belgravia', 'The Hounds of Baskerville' and 'The Reichenbach Fall'. Series 3 episodes are: 'The Empty Hearse', 'The Sign of Three' and 'His Last Vow'. Series 4 episodes are: 'The Six Thatchers', 'The Lying Detective' and 'The Final Problem'.
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