1 2 3 4 5 6 ............................................................................... 1 ................................................................................ 2 .................................................................................... 3/4 ................................................................................ 4 ....................................................................... 5 ............................................................................... 6 .................................................................................... 7 ................................................................................ 8 ............................................................................... 8 ........................................................................................ 9 ............................................................................ 9 .....................................................................................10 .........................................................11 II II 1 2 3 4