The teacher
disconnects
I
N
B
O
O
G
B
G
B
O
O
N
I
I
I
O
G
B
G
I
N
N
B
G
N
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Start
I
History
Start
I
N
B
O
O
G
B
G
B
O
O
N
I
I
I
O
G
B
G
I
N
N
B
G
N
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