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