// "IProbabilistic" - a probabilistic runnable

sinterface IProbabilistic /*extends Runnable*/ {
  public void setScheduler(IProbabilisticScheduler ps);
  public IProbabilisticScheduler scheduler();
  
  /*default void run(IProbabilisticScheduler ps) {
    setScheduler(ps);
    run();
  }*/
  
  default <A> A initAction(A a) {
    scheduler().initAction(a);
    ret a;
  }
  
  // do initial calculations & optionally schedule additional steps
  void step0();
}