When the gang tries to convince Ted that he is being strung along by Tiffany, they reflect about relationships where each of them has been in the same situation.Source: CBS

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After forgetting to get Ted a blind date on Valentine’s Day, Lily and Marshall go after the many discarded girls Barney has dated in order to see if any of them can be Ted’s future wife. Meanwhile, Robin is invited to a party by an obnoxious colleague.Source: CBS

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When Barney is about to complete the perfect week – landing seven different girls in seven days – the gang roots him on in order to forget about their own miserable week.Source: CBS

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When Barney is about to complete the perfect week – landing seven different girls in seven days – the gang roots him on in order to forget about their own miserable week.Source: CBS

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After Marshall’s attractive female colleague kisses him, Lily refuses to believe it, resulting in Marshall convincing Jenkins into telling Lily that it really happened. Meanwhile, Robin uncovers a drinking game which, apparently, is made up about her.Source: CBS

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On the 100th episode, Barney must choose if he should give up wearing suits in order to land a hot bartender, but his conflicted feelings result in an amazingly awesome musical number. Meanwhile, Ted gets closer to meeting the future mother of his kids.Source: CBS

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While Robin clashes with her new jaded co-worker, the gang tries their best to quit smoking.Source: CBS

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