0
1
xy1
xy2
yx3
xy4
xy5
yx6
xz11
xz12
zx13
xz14
xz15
zx16
-10
-9
-8
-7
-6
-5
0
-9
1
2
1
2
3
1
2
3
1
0
11
21
31
22
12
99
123
0
0
1
1
2
0
0
1
1
2
0
0
1
1
2
2
1
1
11
2
3
33
123
1
2
2
3
4
5