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This great book became one of the most important medical books in China. Even today, it is still read by doctors who study traditional Chinese medicine. "I just did what the man at the herb shop told me to do. He was the one to blame!" "It wasn't his fault, either," Li Shizhen said. "Many medical books also say that the two herbs are the same." "Why?" asked the man. Li Shizhen shook his head. He too wondered why.