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
8870
8869
8868
8867
8866
8865
8864
8863
8862
8861
8860
8859
8858
8857
8856
8855
8854
8853
8852
8851
8850