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Computer Object Oriented Concept Difficulty: Medium

Which WLAN IEEE specification allows up to 54Mbps at 2.4GHz? In data preprocessing, what is the term for the identification and removal of duplicate or redundant data? What method in Ruby is used to join the elements of an array into a single string? What is the default access modifier for a class in Java if no access modifier is specified? If a class defines the __str__(self) method, for an object obj for the class, you can use which command to invoke the __str__ method.