-10 -9
-10 -7
-10 -5
-10 -3
-10 -1
-10 0
-10 1
-10 3
-10 7
 -10 9
-10 10
-10 11
-10 20
-5 -10
-5 -5
-5 -3
-5 -2
-5 -1
-5 0
-5 1
-5 3
-5 4
-5 8
-5 10
-5 25
-1 -25
-1 -5
-1 -1
-1 0
-1 1
-1 5
-1 9
-1 10
-1 11
-1 12
-1 20
0 -1
0 0
0 2
0 10
1 -5
1 -1
1 0
1 1 
1 2
1 4
1 7
10
1 20
2 -5
2 0
2 1
2 2
2 3
2 4
2 9
2 19