ABBA were FOUR persons remember.
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Hey you!Think of me when you look at the following pictures.
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Benny, Anni-Frid and Björn without Agnetha 1
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Benny, Anni-Frid and Björn without Agnetha 2
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And guess what: Benny, Anni-Frid and Björn without Agnetha 3!