Folder 6 r 1 1 1 Folder 5 r 1 1 1 Folder 4 r 2 1 Folder 3 r 2 1 Folder 2 r 2 1 Folder 1 r 2 1 Folder 7 r 1 1 Folder 8 r 1 1 Folder 9 r 1 1 Folder 10 r 1 1 Folder 11 r 1 Folder 12 r 1 1 Folder 13 r 1 Folder 14 r 1 Folder 15 r 1 M(a1) M(a2) M(a1) 1 1 M(a1) 1 1 1 1 M(a1) M(a2) 1 1 1 1 C(a2) C(a2) C(a2) C(a2) M(a1) M(a2) M(a1) u(a2) u(a2) u(a2) u(a2) M(a2) M(a1) M(a2) C(a1) C(a1)