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Program 2
using System.Collections;
namespace Templates.Observer {

 public class Observer {

   private Subject mySubject;

   public Observer (Subject s){
     mySubject = s;
   }   

   public void Update(){
      SubjectState state = mySubject.GetState();

      //   if (the state is interesting){
      //      react on state change
      //   }
   }
 }
}