what is
a
trigger?
N
G
G
G
B
B
N
B
I
O
B
G
I
B
I
I
I
G
N
O
O
O
O
N
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Start
N
History
Start
N
G
G
G
B
B
N
B
I
O
B
G
I
B
I
I
I
G
N
O
O
O
O
N
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