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In page Paul Cézanne:

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In the same year, he exhibited three of his works at the group Les XX in Brussels. The Société des Vingt, short Les XX or Les Vingt, was an association founded around 1883 by Belgian artists or artists living in Belgium, including Fernand Khnopff, Théo van Rysselberghe, James Ensor and the siblings Anna and Eugène Boch.[citation needed]