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In page Sistar:

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On 27 April 2011, it was announced that Sistar would debut a sub-unit, Sistar19, with members Hyolyn and Bora.[citation needed] Sistar19 had their debut performance on 5 May and promoted throughout the month.<[citation needed] Sistar returned on 9 August with their first studio album entitled So Cool.[8] "So Cool" was the inaugural number one song on the Billboard K-pop Hot 100 chart after the chart's launch on 25 August.[9] On 11 September, Sistar won their first "Mutizen Award" on Inkigayo.[citation needed]