17 interface A {
25 interface B extends A {
36 interface C1 {  variable
40 interface C2 {  variable
46 interface C3 extends C1 {  variable
54 interface D4 extends D3, D2 {
58 interface D1 {
62 interface D3 {
66 interface D2 extends D1 {
70 interface D5 extends D4, D1, D3 {
76 interface E {  variable
80 interface E {  variable
84 interface E {  variable
90 interface F {