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Watch How I Met Your Mother Season 8 Episode 18 online via TV Fanatic with over 7 options to watch the How I Met Your Mother S8E18 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Amazon Prime, and Lifetime.
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Will Barney's legendary relationship playbook show up when Ted needs help or was it truly destroyed on How I Met Your Mother?