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