des (0, 8, 5)
(0,"CU !E2",3)
(0,"CU !E1",4)
(1,"CU !E1",1)
(2,"CU !E2",2)
(3,"CU !E2",3)
(3,"CU !E1",1)
(4,"CU !E2",2)
(4,"CU !E1",4)