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When Lily and Marshall realize that Robin and Barney are the perfect double-date friends, they try too hard to impress and come on too strong, forcing Barney and Robin to try to break up with them.
When Robin fears that Barney is cheating on her, she soon discovers that he is spending his evenings with Ted learning everything there is to know on how to date her.
While Barney tries to convince Robin to become an American citizen, Ted and Marshall's fabled road trip takes a wrong turn when Marshall invites Lily.