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Mark Duplass and Lynn Shelton 'Your Sister's Sister'

From the THR Video Lounge at Sundance, Mark Duplass and director Lynn Shelton promote their dramedy, Your Sister's Sister, which shot in just 12 days.

Of the final product, Duplass says, "The movie kind of comes together in the editing process." Actors estimate that about 85% of the film was improvised.

RELATED VIDEO: 'Your Sister's Sister' Stars Rosemarie DeWitt and Emily Blunt