code: public Collection<TileRef> getDirectTransitiveTiles(Transition transition)
      {
          final String groupOut = transition.getOut();
          final Collection<GroupTransition> currentTransitives = getTransitives(transition.getIn(), groupOut);
          if (currentTransitives.size() != 2)
          {
              return Collections.emptySet();
          }
          final GroupTransition groupTransition = currentTransitives.iterator().next();
          return mapTransition.getTiles(new Transition(transition.getType(), groupTransition.getOut(), groupOut));
      }
docs: Get the associated tiles with the direct transitive transition.
  
  @param transition The transition reference.
  @return The associated tiles from direct transitive transition.