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An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
The guys are concerned as Sheldon searches for an alternative to human companionship.
Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.
Sheldon begins a platonic relationship with Amy, Howard reconnects with Bernadette eventually asking her to marry him, Leonard begins to date Raj's sister Priya, Penny becomes friends with Amy and expresses regret at breaking up with Leonard.