For discussion of depth first search problem at codeabbey:
http://www.codeabbey.com/index/forum_topic/824fad27a7ac350fe93801fbf830a73d

for each node here are lists of adjacent edges

0: 9,29,38,39,47
1: 20,24,43
2: 8,9,31,37,44
3: 16,23,35
4: 31,33
5: 10,11,18,26,43
6: 25,28,33
7: 13,15,20,35,36,39,42
8: 2,12,20,28,30
9: 0,2,22,33,40,43,44,46
10: 5,17,45
11: 5,30,32,33,40
12: 8,15,43
13: 7,24,26,28,34,37,40,46
14: 15,16,38
15: 7,12,14,20,36,37,43,45
16: 3,14,19,28
17: 10,39,41,45
18: 5,36,41,46
19: 16,28,34,41,44
20: 1,7,8,15,29,34,43
21: 24,30,31,36,37
22: 9,26,27,32
23: 3,24,26,30,42,44
24: 1,13,21,23,26,34,45
25: 6,26,32,40
26: 5,13,22,23,24,25,38
27: 22,29,33
28: 6,8,13,16,19,29,45
29: 0,20,27,28,34,36
30: 8,11,21,23,41,47
31: 2,4,21,35
32: 11,22,25,44,46
33: 4,6,9,11,27
34: 13,19,20,24,29,36,39
35: 3,7,31,36
36: 7,15,18,21,29,34,35,47
37: 2,13,15,21,40,42
38: 0,14,26,39
39: 0,7,17,34,38,42
40: 9,11,13,25,37,46
41: 17,18,19,30
42: 7,23,37,39
43: 1,5,9,12,15,20
44: 2,9,19,23,32,46,47
45: 10,15,17,24,28
46: 9,13,18,32,40,44
47: 0,30,36,44