Suggest to improve the challenge in Chapter 4 Abstract class

Just don’t quite understand the purpose of this exercise. Is it the author wants to let us know even concrete class can be declared abstract? Otherwise, I don’t think there is need to declare the parent class as abstract

This whole chapter is mostly preparation for Chapter 5, “Interfaces”. Try going through that chapter first and seeing if this makes more sense afterward. Let me know after that if you have any recommendations for making the challenge in this chapter be more understandable.

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Thank you let me think a while about this.

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