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In this picture taken on December 6, 2017, shoes are seen outside the entrance of a room at a migrant village on the outskirts of Beijing. The hundreds of millions of migrants who moved from the countryside to the cities may have fuelled China's dramatic economic boom of recent decades. But many are no longer welcome in overcrowded Beijing, which seeks to cap its population at 23 million by 2020. / AFP PHOTO / Nicolas ASFOURI / TO GO WITH China-rights-economy-migration, FOCUS by Ryan MCMORROW and Joanna CHIU (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)

In this picture taken on December 6, 2017, shoes are seen outside the entrance of a room at a migrant village on the outskirts of Beijing. The hundreds of millions of migrants who moved from the countryside to the cities may have fuelled China's dramatic economic boom of recent decades. But many are no longer welcome in overcrowded Beijing, which seeks to cap its population at 23 million by 2020. / AFP PHOTO / Nicolas ASFOURI / TO GO WITH China-rights-economy-migration, FOCUS by Ryan MCMORROW and Joanna CHIU (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)
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AFP NICOLAS ASFOURI