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