premise: PBS is an American television program distributor.
hypothesis: The Public Broadcasting Service ( PBS ) is an American public broadcaster and television program distributor . Headquartered in Arlington , Virginia , PBS is an independently operated non-profit organization and is the most prominent provider of television programming to public television stations in the United States , distributing series such as Keeping Up Appearances , BBC World News , NOVA scienceNOW , NOVA , Barney and Friends , Arthur , Sesame Street , PBS NewsHour , Walking with Dinosaurs , Masterpiece , Nature , American Masters , Frontline , and Antiques Roadshow .