I want to know the answer to the following question:
How many prefecture-size cities are in the province of Anhui?
All the background I'm provided with is that "Nanjing borders Yangzhou to the northeast, one town downstream when following the north bank of the Yangtze, Zhenjiang to the east, one town downstream when following the south bank of the Yangtze, and Changzhou to the southeast.". Is that enough to answer the question?
Answer: no