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working code :-

String temp=super.define_me();
         BiCycle b=new BiCycle();
         b.define_me(); 

`

String temp=super.define_me();

Solution :- String temp=super.define_me();

i think we sould call here==> String temp=define_me(); method of the parent class instead of the method of child class to be like this ==> String temp=super.define_me();