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In page Yui Yokoyama:

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Yokoyama's first attempt to join AKB48 or a sister group was for SKE48's second generation, but her audition was unsuccessful. She later passed the auditions with AKB48, and became a ninth-generation kenkyusei (trainee) member on September 20, 2009.[citation needed] She was the first of her generation to be promoted, which took place at AKB48 Tokyo Matsuri on October 10, 2010, and where she became a member of Team K.[1]