40
0  12
2  12
4  12
6  12
8  12
10  12
12  12
14  12
16  12
18  12
20  12
22  12
24  12
26  12
28  12
30  12
32  12
34  12
36  12
38  12
38  0
36  0
34  0
32  0
30  0
28  0
26  0
24  0
22  0
20  0
18  0
16  0
14  0
12  0
10  0
8  0
6  0
4  0
2  0
0  0