8 N1 10 N2 10 N3 10 N4 10 N5 0 N6 0 N7 0 N8 0 # N1 - N2 # | | # N4 - N3 # | # N5 - N6 # | | # N8 - N7 N1 N2 N2 N1 N2 N3 N3 N2 N3 N4 N4 N3 N4 N1 N1 N4 N4 N5 N5 N4 N5 N6 N6 N5 N6 N7 N7 N6 N7 N8 N8 N7 N8 N5 N5 N8