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In page Brown Eyed Girls:

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On January 17, 2011, the group released a Japanese music video for "Sign".[1] The group started their promotions in Japan in early 2011.[2] Brown Eyed Girls originally planned to hold a concert in Japan in April but due to the Tōhoku earthquake in March, the concert was postponed to September instead. The band's first Japanese concert at C.C Lemon Hall in Shibuya took place on September 12. There, they unveiled one of the songs from their fourth album An Inconvenient Truth, which was composed by JeA and KZ.[3] On September 6, NegaNetwork released an official comeback date, marking the end of their two-year hiatus. The group was expected to release the single "Hot Shot" on September 16, followed by their fourth album and music video Sixth Sense on September 23.[citation needed]