Write a
decently
hard
program
G
G
O
O
B
I
G
N
I
I
I
O
B
G
O
B
N
G
N
I
B
O
B
N
N
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Start
G
History
Start
G
G
O
O
B
I
G
N
I
I
I
O
B
G
O
B
N
G
N
I
B
O
B
N
N
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