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WikiPedia: Volume_Up http://www.allkpop.com/2012/01/4minute-to-make-gro... http://www.allkpop.com/2012/04/4minute-releases-ec... http://www.popreviewsnow.com/2012/04/girl-group-sh... http://www.soompi.com/2012/04/28/4minute-performs-... https://www.youtube.com/watch?v=qsWl1--Niyg