V =
(0:-1)[20:21:21]
(1:-1)[14:0:0]
(2:-1)[10:6:6]
(3:-1)[2:0:0]
(4:-1)[19:2:2]
(5:-1)[1:13:13]
(6:-1)[0:14:14]
(7:-1)[3:0:0]
(8:-1)[7:20:20]
(9:-1)[11:0:0]
(10:-1)[9:3:3]
(11:-1)[0:0:0]
(12:-1)[6:15:15]
(13:-1)[0:10:10]
(14:-1)[4:9:9]
(15:-1)[0:4:4]
(16:-1)[0:0:0]
(17:-1)[12:5:5]
(18:-1)[0:0:0]
(19:-1)[8:0:0]
(20:-1)[15:16:16]
(21:-1)[16:12:12]
(22:-1)[13:19:19]
(23:-1)[0:18:18]
(24:-1)[18:7:7]
(25:-1)[21:1:1]
(26:-1)[17:8:8]
(27:-1)[5:11:11]
(28:-1)[0:17:17]
E =
{1,0} (-1)
{5,0} (-1)
{2,1} (-1)
{6,1} (-1)
{3,2} (-1)
{7,2} (-1)
{4,3} (-1)
{8,3} (-1)
{9,4} (-1)
{6,5} (-1)
{11,5} (-1)
{7,6} (-1)
{12,6} (-1)
{8,7} (-1)
{13,7} (-1)
{9,8} (-1)
{14,8} (-1)
{10,9} (-1)
{15,9} (-1)
{12,11} (-1)
{13,12} (-1)
{17,12} (-1)
{14,13} (-1)
{15,14} (-1)
{18,14} (-1)
{16,15} (-1)
{20,17} (-1)
{24,20} (-1)
{22,21} (-1)
{27,21} (-1)
{16,10} (-1)
{19,16} (-1)
{22,19} (-1)
{28,22} (-1)
{24,23} (-1)
{25,24} (-1)
{26,25} (-1)
{27,26} (-1)
{28,27} (-1)