[D(1),2,4
(2),6
(3),1,2
(4),3,5
(5),7,
(6),4,5,7
(7)]


[D(1),2,4,
(2),3,
(3),4,6,
(4),5,
(5),6,
(6)]


[U(1),2,3,4,5,
(2),3,5,
(3),4,8,
(4),6,
(5),7,8,
(6),8,
(7),8]