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One Direction sings the ABCs with Bert on "Sesame Street"

Do you know your ABCs? The guys from One Direction do. Mostly.

Liam Payne and Harry Styles sing the alphabet along with Bert from "Sesame Street" in a cute newly released video teasing their upcoming visit to the PBS series.

Things get off to a great start, but once the One Direction gang reaches the end of the alphabet -- it goes a bit awry.

One Direction will appear on the 45th season of "Sesame Street" this fall. Watch the teaser below:

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