f(x) - Electric Shock

Stepherd

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[video]http://www.youtube.com/watch?v=n8I8QGFA1oM[/video]

f(x) ( /ˌɛf ˈɛks/; Korean: 에프엑스) is a South Korean girl group formed by SM Entertainment in 2009. The name is a play on the mathematical notation for function. The f stands for flower and the x represents the female's double x chromosome.
 
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