Main {
  public static void main(String args[]) throws Exception {{
    A a = A.parse(System.in);
    D d1 = a.violation1();
    D d2 = a.no_violation1(new C(new D()));

    d1.set_d2(new Vector());
    Vector v1 = d1.get_d2();
    v1.add(A.parse(" ( e e ) "));

    d1.check_collections();
    System.out.println("done");

  }}
}

A {
{{
D violation1() { return 
  this.
  get_b().
  get_c().
  get_d();}
D no_violation1(C c1) { return 
  c1.
  get_d();}
}}
}

D {
{{
  void check_collections() {
    System.out.println(" check collections (Vector) ");
    Vector v1 = this.get_d2();
	  for(int i=0;i<v1.size();i++) {
			      A a = (A) v1.elementAt(i); 
			      D d3 = a.violation1();
          }

  }
}}
}