Mark Hamill stars as Luke Skywalker, here with the character Yoda, in "Star Wars: The Empire Strikes Back," which is among the films selected by the Library of Congress for preservation in its National Film Registry. (AP Photo/Lucasfilm Ltd)

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Mark Hamill stars as Luke Skywalker, here with the character Yoda, in "Star Wars: The Empire Strikes Back," which is among the films selected by the Library of Congress for preservation in its National Film Registry. (AP Photo/Lucasfilm Ltd)