'Greg'
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Sherlock:
Oh, this is Mycroft, isn't it?
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Lestrade:
No, look...
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Sherlock:
Of course it is! One mention of Baskerville and he sends down my handler to spy on me incognito! Is that why you're calling yourself 'Greg'?
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John:
...that's his name!
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Sherlock:
Is it?
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Lestrade:
Yes, if you'd ever bothered to find out.