Just a notion that’s all

Two lean mean fighting machines as Agnetha and Frida
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Anni-Frid and Görel as Tall Frida and Short Görel

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Frida L. and Agnetha F. in "Pyjama Party"

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Björn Ulvaeus as The Rubberball man

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Lory and Paulie as Benny and Frida