Stock Photo - 15 November 2018, Baden-Wuerttemberg, Stuttgart: A chewing gum wall hangs from a tram stop on a mast. Stuttgarter Straßenbahnen (SSB) is testing ""Gum-Walls"" to get a better grip on the problem of chewing gum contamination. Passengers should no longer spit their chewing gum on the street, but stick it to metal boxes on colourfully printed paper that is easy to dispose of. Photo: Marijan Murat/dpa. - Stuttgart/Baden-Wuerttemberg/Germany

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