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  What is the principal purpose of holograms?
  How is hologram effective in preventing forgery?
  Aren’t holograms expensive?
  What is necessary in making holograms?
  What is the difference between analog and digital methods?
  What is the reason for the cost difference in the master production?
  In what ways can holograms be applied?
  How long does it take to manufacture hologram?
  Why Sun Kyung Hologram?