Full
Duplex
G
N
G
G
O
N
B
G
B
I
O
I
N
O
O
I
I
B
G
B
I
N
B
O
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Start
G
History
Start
G
N
G
G
O
N
B
G
B
I
O
I
N
O
O
I
I
B
G
B
I
N
B
O
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