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abstract class SelfBoundedType<T extends SelfBoundedType<T>> {

abstract T f(T arg);

T g(T arg) {

System.out.println("g(T arg)");

return f(arg);

}

}

class D extends SelfBoundedType<D> {

D f(D arg) {

System.out.println("f(D arg)");

return arg;

}

}

public class Exercise34 {

public static void main(String[] args) {

D d = new D();

d.f(d).g(d);

}

}