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![Combinatorial Optimization and Applications: 13th International Conference, COCOA 2019, Xiamen, China, December 1315, 2019, Proceedings [Paperback]](/itemImage/2/9/1/3/2_5267513.jpg "Combinatorial Optimization and Applications: 13th International Conference, COCOA 2019, Xiamen, China, December 1315, 2019, Proceedings [Paperback]")