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Students in Japan have reportedly caused sales of Kit Kat bars to soar, by adopting them as lucky charms.
The name of the chocolate bar resembles a Japanese expression - "kitto katsu" - used by students to wish each other luck before exams.
The phrase has been translated roughly as: "I hope you will win."
The Kit Kat name is thought to derive from a club of the same name in 1920s London.