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1.9 Finding the Intersection of Two Dictionaries
发现两个字典的交集
Credit: Andy McKay, Chris Perkins, Sami Hangaslammi
1.9.1 Problem
问题 Given two dictionaries, you need to find the set of keys that are in both dictionaries. 给出两个字典，你需要找到在两个字典里都有的键的集合。
1.9.2 Solution
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