Here's a challenge /sci/. Find the relationship between the following set of numbers. Any rule or detail you can come up with regarding the pattern.

0 0
4 2
8 4
2 6
6 8
1 0
5 2
9 4
3 6
7 8
2 0
6 2
0 4
4 6
8 8
3 0
7 2
1 4
5 6
9 8
4 0
8 2
2 4
6 6
0 8
5 0
9 2
3 4
7 6
1 8
6 0
0 2
4 4
8 6
2 8
7 0
1 2
5 4
9 6
3 8
8 0
2 2
6 4
0 6
4 8
9 0
3 2
7 4
1 6
5 8
0 0