50
0 1 | 0 0
0 1 | 0 1
0 1 | 0 2
0 1 | 1 0
0 1 | 2 0
0 2 | 0 0
0 2 | 0 1
0 2 | 0 2
0 2 | 1 0
0 2 | 2 0
0 3 | 0 0
0 3 | 0 1
0 3 | 0 2
0 3 | 1 0
0 3 | 2 0
0 4 | 0 0
0 4 | 0 1
0 4 | 0 2
0 4 | 1 0
0 4 | 2 0
1 2 | 0 0
1 2 | 0 1
1 2 | 0 2
1 2 | 1 0
1 2 | 2 0
1 3 | 0 0
1 3 | 0 1
1 3 | 0 2
1 3 | 1 0
1 3 | 2 0
1 4 | 0 0
1 4 | 0 1
1 4 | 0 2
1 4 | 1 0
1 4 | 2 0
2 3 | 0 0
2 3 | 0 1
2 3 | 0 2
2 3 | 1 0
2 3 | 2 0
2 4 | 0 0
2 4 | 0 1
2 4 | 0 2
2 4 | 1 0
2 4 | 2 0
3 4 | 0 0
3 4 | 0 1
3 4 | 0 2
3 4 | 1 0
3 4 | 2 0