20
-5 -9
3 10
10 0
7 -7
7 7
-8 -6
-16 12
9 4
-10 2
-16 -12
-10 -2
-1 10
6 19
3 -10
-8 6
-1 -10
6 -19
20 0
9 -4
-5 9