ASubclasses can override member variables of the parent class
BSubclasses inherit all member variables and methods of the parent class
CSubclasses can add member variables and methods
DSubclasses can override member methods of the parent class
ASubclasses can override member variables of the parent class
BSubclasses inherit all member variables and methods of the parent class
CSubclasses can add member variables and methods
DSubclasses can override member methods of the parent class
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