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- Klenke Quartett Photo: Marco Borggreve
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- Klenke-Quartett (c) Irene Zandel
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- Klenke-Quartett-1 (c) Marco Borggreve
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- Klenke-Quartett-4 (c) Marco Borggreve
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- Klenke-Quartett (c) Irene Zandel 3
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- Klenke Quartett Photo: Marco Borggreve