In between Ludwig van Beethoven and Heinrich Marschner who was the most important composer of German opera between Weber and Wagner?
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Answer: Heinrich August Marschner

Are both Elia Kazan and Maurice Elvey a filmmaker?
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Answer: yes

Who was a Greek film director Andrew Lau or Yannis Smaragdis?
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Answer:
Iannis Smaragdis (Greek: ) is a Greek film director.