At a party, a girl had a necklace. Another girl was dancing near her, and some boys and girls were all around the girl with the necklace. The lights turned off, and a camera flashed a few times, then the lights turned back on, the necklace was gone! They put a lie-detector on EVERYONE, and no one took it. Then, the person with the camera said, "I know who did it!" Who did it?
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