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