2(x, y)xyxy
|x||y| 2310 (0, 0)
1212
12 56
23 56
13 10
0 0
12 34
0 0
0 0
12 10 23 56
12 34 12 34
-----------------------------------------------------------------------




















2(x, y)xyxy
|x||y| 2310 (0, 0)
1212
12 56
23 56
13 10
0 0
12 34
0 0
0 0
12 10 23 56
12 34 12 34
-----------------------------------------------------------------------