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Yankees' 'Core Four' is dwindling to one - Los Angeles Times
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YANKEES: Andy Pettitte loses to Mariners in return
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YANKEES: Andy Pettitte beats Mariners for 250th career win
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Andy Pettitte joins Yankees as advisor
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Andy Pettitte – Society for American Baseball Research
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Andy Pettitte Retires: 10 Pitchers New York Yankees Will Look To
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A different perspective': How Andy Pettitte plans to attack new
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A look back at Pettitte's stellar career
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Andy Pettitte excited to rejoin Yankees as pitching adviser