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Queen Mathilde of Belgium and Pierre-Olivier Rollin Director of BPS22 Musee d'art de la province du Hainaut look at art work during a royal visit to the exhibition 'Marthe Wery, Oeuvres, recherches et documents dans les collections du BPS22' in the BPS22 Musee d'Art de la Province de Hainaut, on March 21, 2017 in Charleroi. / AFP PHOTO / Belga / ERIC LALMAND / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION (Photo credit should read ERIC LALMAND/AFP/Getty Images)

Queen Mathilde of Belgium and Pierre-Olivier Rollin Director of BPS22 Musee d'art de la province du Hainaut look at art work during a royal visit to the exhibition 'Marthe Wery, Oeuvres, recherches et documents dans les collections du BPS22' in the BPS22 Musee d'Art de la Province de Hainaut, on March 21, 2017 in Charleroi. / AFP PHOTO / Belga / ERIC LALMAND / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION (Photo credit should read ERIC LALMAND/AFP/Getty Images)
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AFP ERIC LALMAND

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Queen Mathilde of Belgium and Pierre-Olivier Rollin Director of BPS22 Musee d'art de la province du Hainaut look at art work during a royal visit to the exhibition 'Marthe Wery, Oeuvres, recherches et documents dans les collections du BPS22' in the BPS22 Musee d'Art de la Province de Hainaut, on March 21, 2017 in Charleroi. / AFP PHOTO / Belga / ERIC LALMAND / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION (Photo credit should read ERIC LALMAND/AFP/Getty Images)

Queen Mathilde of Belgium and Pierre-Olivier Rollin Director of BPS22 Musee d'art de la province du Hainaut look at art work during a royal visit to the exhibition 'Marthe Wery, Oeuvres, recherches et documents dans les collections du BPS22' in the BPS22 Musee d'Art de la Province de Hainaut, on March 21, 2017 in Charleroi. / AFP PHOTO / Belga / ERIC LALMAND / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION (Photo credit should read ERIC LALMAND/AFP/Getty Images)
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AFP ERIC LALMAND

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Queen Mathilde of Belgium and Pierre-Olivier Rollin Director of BPS22 Musee d'art de la province du Hainaut speak together during a royal visit to the exhibition 'Marthe Wery, Oeuvres, recherches et documents dans les collections du BPS22' in the BPS22 Musee d'Art de la Province de Hainaut, on March 21, 2017 in Charleroi. / AFP PHOTO / Belga / ERIC LALMAND / Belgium OUT (Photo credit should read ERIC LALMAND/AFP/Getty Images)

Queen Mathilde of Belgium and Pierre-Olivier Rollin Director of BPS22 Musee d'art de la province du Hainaut speak together during a royal visit to the exhibition 'Marthe Wery, Oeuvres, recherches et documents dans les collections du BPS22' in the BPS22 Musee d'Art de la Province de Hainaut, on March 21, 2017 in Charleroi. / AFP PHOTO / Belga / ERIC LALMAND / Belgium OUT (Photo credit should read ERIC LALMAND/AFP/Getty Images)
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AFP ERIC LALMAND

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Queen Mathilde of Belgium and Pierre-Olivier Rollin Director of BPS22 Musee d'art de la province du Hainaut speak together during a royal visit to the exhibition 'Marthe Wery, Oeuvres, recherches et documents dans les collections du BPS22' in the BPS22 Musee d'Art de la Province de Hainaut, on March 21, 2017. / AFP PHOTO / Belga / ERIC LALMAND / Belgium OUT (Photo credit should read ERIC LALMAND/AFP/Getty Images)

Queen Mathilde of Belgium and Pierre-Olivier Rollin Director of BPS22 Musee d'art de la province du Hainaut speak together during a royal visit to the exhibition 'Marthe Wery, Oeuvres, recherches et documents dans les collections du BPS22' in the BPS22 Musee d'Art de la Province de Hainaut, on March 21, 2017. / AFP PHOTO / Belga / ERIC LALMAND / Belgium OUT (Photo credit should read ERIC LALMAND/AFP/Getty Images)
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AFP ERIC LALMAND