Hello, I have some question about how step motor really works. I followed this tutorial, This link. It works just fine, it turns clock wisely. What I don't understand is 1. when I disconnected the pink and orange wires it still turns clock-wise. Why? 2. Now I disconnected the blue and yellow wires pink and orange remains intact, it turns again but it turns counter-clockwise. Now when I had all four wires connected why does it not cancels out itself? Why it still turns clock-wise? Why do I need to use the pink-orange pair? Thanks.