The two right ladies are the same as the two left ladies. The right ladies are in black silhouette and stay like that until the end of the movie.
The two left ladies become more and more visible (we keep it decent). Maybe you can see them or parts of them going back and forth in the beginning. Reaching the end of the movie it becomes more and more impossible to see them going back and forth (in my opinion). Please tell me if you still can.