V =
(0:-1)[4:1:1]
(1:-1)[3:0:0]
(2:-1)[0:0:0]
(3:-1)[0:3:3]
(4:-1)[0:7:7]
(5:-1)[0:0:0]
(6:-1)[9:0:0]
(7:-1)[1:10:10]
(8:-1)[0:0:0]
(9:-1)[0:5:5]
(10:-1)[10:6:6]
(11:-1)[0:4:4]
(12:-1)[0:0:0]
(13:-1)[8:2:2]
(14:-1)[7:9:9]
(15:-1)[6:0:0]
(16:-1)[5:8:8]
(17:-1)[0:0:0]
(18:-1)[2:0:0]
(19:-1)[0:0:0]
E =
{1,0} (-1)
{2,1} (-1)
{5,1} (-1)
{3,2} (-1)
{6,2} (-1)
{4,3} (-1)
{7,3} (-1)
{6,5} (-1)
{10,5} (-1)
{7,6} (-1)
{11,6} (-1)
{8,7} (-1)
{12,7} (-1)
{10,9} (-1)
{14,9} (-1)
{11,10} (-1)
{15,10} (-1)
{12,11} (-1)
{16,11} (-1)
{13,12} (-1)
{15,14} (-1)
{16,15} (-1)
{18,15} (-1)
{8,4} (-1)
{13,8} (-1)
{17,13} (-1)