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Who will help me solve a mathematical reasoning problem?
First, according to the third known condition, you can study geography or chemistry in Beijing, and the fourth point tells Suzhou to study chemistry, so Beijing studies geography and Nanjing studies physics.

According to the second and fifth points, we can see that Li Rong is studying physics in Nanjing. According to the first point and Li Rong's inferred location, we can know that Zhang Ning studied chemistry in Suzhou, so Wang Xiao studied geography in Beijing.