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People walk by the graffiti work in south of Athens, Greece, May 27, 2018. About 30 artists attended the Graffiti Festival. (Xinhua/Lefteris Partsalis)

People walk by the graffiti work in south of Athens, Greece, May 27, 2018. About 30 artists attended the Graffiti Festival. (Xinhua/Lefteris Partsalis)