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In July 2011 After School (애프터스쿨) was divided into two sub-groups, After School Red (애프터스쿨 레드) and After School Blue (애프터스쿨 블루). Both groups released a single and promoted their own songs at the same time. While A.S. BLUE features an innocent concept, A.S. RED features a sexy and powerful concept. Both groups' debut singles were released as After School 4th single.
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