V =
(0:-1)[0:0:0]
(1:-1)[0:0:0]
(2:-1)[0:1:1]
(3:-1)[0:0:0]
(4:-1)[0:0:0]
(5:-1)[1:0:0]
(6:-1)[0:0:0]
(7:-1)[0:0:0]
E =
{1,0} (-1)
{3,0} (-1)
{2,1} (-1)
{4,1} (-1)
{4,3} (-1)
{5,3} (-1)
{6,4} (-1)
{6,5} (-1)
{7,6} (-1)