X
Y
0
1
2
3
4
5
6
7
8
9
10
11
12
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
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