15.5 15.4 15.3 15.2 15.1 14 13 12 11.2 11.12 11.11p 11q 12 13.1 13.2 13.3 13.4 13.5 14.1 14.2 14.3 21 22.1 22.2 22.3 23.1 23.2 23.3 24 25