Has the minimum number of classes and methods necessary to accomplish the first three?
用最少的类和必需的方法完成前3个任务。
The system contains the minimum number of classes possible without violating (1) or (2).
这个系统包含尽可能少的类，并且同时不违背(1)或(2)。
These three classes can be used to store a large number of classes.
这三个类可以用来存储大量的类。
These three classes can be used to store a large number of classes.
这三个类可以用来存储大量的类。
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