L+N2-1L+N2-2L+N-1L+N-2L+N2-3L+N-3L+N-4L+N2-4L+N-5L+N-6L+N-7L+N2-5L+N2-6L+N2-7L+N-8L+N2-8L+N2-9L+N-9L+N2-10L+N2-11