C72 Seven Bridges Problem

With regards to such a request, Duan Lingfei obviously could not reject it.

Just as he finished speaking, Bai Youqing had already turned around and brought out a pen and paper from the secretary behind him. He drew a pattern on the paper and handed it over to Duan Lingfei.

"In the eighteenth century, there was a beautiful little town in Europe, the castle of Gonisburg