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S04E21

The Three Days Rule

• 20:00 • CBS

• 2009-04-27

The Three Days Rule (S04E21) is the twenty-first episode of season four of "How I Met Your Moth... More The Three Days Rule (S04E21) is the twenty-first episode of season four of "How I Met Your Mother" released on Mon Apr 27, 2009. How I Met Your Mother stars and .

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