16
0 0
0 20
10 20
10 10
20 10
20 20
30 20
30 10
40 10
40 20
50 20
50 10
60 10
60 20
70 20
70 0
20
0 0
0 30
10 30
10 40
20 40
20 30
40 30
40 40
50 40
50 30
60 30
60 0
50 0
50 -10
40 -10
40 0
20 0
20 -10
10 -10
10 0
