Solve steps:
6, 12
7, 12
8, 12
9, 11
8, 11
9, 10
10, 9
10, 8
9, 7
10, 6
10, 5
10, 4
11, 3
10, 2
9, 1
8, 0
9, 0
10, 1
11, 0
12, 1
12, 2
12, 3
12, 4
12, 5
11, 6
12, 7
12, 8
12, 9
12, 10
12, 11
11, 12
10, 12
11, 11
10, 10
9, 9
8, 9
7, 10
6, 10
5, 9
4, 10
3, 9
3, 8
3, 7
2, 6
1, 6
0, 5
1, 4
2, 3
2, 4
1, 3
0, 3
1, 2
1, 1
2, 0
3, 1
4, 1
5, 2
6, 2
7, 2
8, 3
7, 3
6, 3
7, 4
6, 5
6, 6