Y \ X
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
8690
8689
8688
8687
8686
8685
8684
8683
8682
8681
8680
8679
8678
8677
8676
8675
8674
8673
8672
8671
8670