b
a
0
trigger
b
a
1
trigger
b
a
2
trigger
b
b
3
a
a
4
a
b
5
trigger
a
b
6
trigger
a
a
7
b
b
8
a
b
9
trigger
b
a
10
trigger
b
b
11
b
a
12
trigger
b
b
13
b
a
14
trigger
a
a
15
a
a
16
b
b
17
a
a
18
a
a
19
a
a
20
b
b
21
a
a
22
a
a
23
a
a
24
a
b
25
trigger
a
b
26
trigger
b
b
27
a
b
28
trigger
b
a
29
trigger
a
a
30
a
a
31
a
b
32
trigger
b
b
33
b
a
34
trigger
a
a
35
a
a
36
a
b
37
trigger
b
a
38
trigger
b
a
39
trigger
a
b
40
trigger
b
a
41
trigger
b
b
42
a
a
43
a
b
44
trigger
b
a
45
trigger
b
b
46
b
a
47
trigger
a
a
48
a
a
49
23