"In this image released by CBS, David Letterman appears during a taping of his final ""Late Show with David Letterman,"" Wednesday, May 20, 2015 at the Ed Sullivan Theater in New York. After 33 years in late night television, 6,028 broadcasts, nearly 20,000 total guest appearances, 16 Emmy Awards and more than 4,600 career Top Ten Lists, David Letterman is retiring. (Jeffrey R. Staab/CBS via AP) Photo: Jeffrey R. Staab, HONS / Associated Press / CBS ENTERTAINMENT"
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