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Leonard and Penny try hanging out alone, and Sheldon must overcome his fear of birds.
Amy is crushed when Bernadette and Penny go shopping for wedding dresses without her.
Sheldon considers taking his relationship with Amy to the next level when Stuart from the comic book store asks her out on a date.
Penny regrets her sleeping with Raj and has become very good friends with Leonard, Leonard breaks up with Priya, Amy pushes Sheldon in their relationship eventually becoming boyfriend and girlfriend, Penny and the other women become a clique of their own, Howard prepares for his wedding and going into space to the International Space Station and Leonard asks Penny out as they begin "Leonard and Penny 2.0".