4
0 0
0 1
1 1
1 0

6
0 10
5 10
5 5
10 5
10 0
0 0

8
0 0
0 2
1 2
1 1
2 1
2 2
3 2
3 0

8
0 0
0 5
5 5
5 10
10 10
10 15
15 15
15 0

8
5 10
10 10
10 15
15 15
15 0
0 0
0 5
5 5

14
0 0
0 10
10 10
10 20
20 20
20 30
30 30
30 25
25 25
25 15
15 15
15 5
5 5
5 0

14
20 30
30 30
30 25
25 25
25 15
15 15
15 5
5 5
5 0
0 0
0 10
10 10
10 20
20 20

20
8 0
8 7
4 7
4 13
0 13
0 16
5 16
5 21
12 21
12 25
18 25
18 20
30 20
30 18
33 18
33 11
29 11
29 5
14 5
14 0

20
10 0
10 5
5 5
5 20
0 20
0 25
7 25
7 30
40 30
40 35
42 35
42 27
45 27
45 22
50 22
50 17
42 17
42 5
20 5
20 0

0