0,0,
1,1,
2,2,
3,3,
4,4,
5,5,
6,6,
7,7,
8,8,
9,9,
10,10,
11,11,
12,12,
13,13,
14,14,
15,15,
16,16,
17,17,
18,18,
19,19,
20,20,
21,21,
22,22,
23,23,
24,24,
25,25,
26,26,
27,27,
28,28,
29,29,
30,30,
31,31,
