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Origin of the Problem In the early 18th century, in the city of Königsberg in Prussia (now Kaliningrad), a problem was discussed among the people. Königsberg was divided into four landmasses by the Pregel River flowing through its center, and a total of seven bridges connected these landmasses. The city dwellers wondered whether it was possible to take a walk crossing each bridge exactly once. The striking feature of the problem was that no specific starting or ending point was specified, yet th