R+E-1R+E-2R+E-3R+E-4R+E-5R+E-6R+E-7R+E-8R+E-9R+E-10R+E-11R+E-12R+E-13R+E-14R+E-15R+E-16R+E-17R+E-18R+E-19R+E-20