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