Started
with the
hardest
task first.
N
B
N
O
I
B
I
O
O
I
I
N
B
G
O
B
G
N
I
B
G
G
G
N
O
Size:
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Start
N
History
Start
N
B
N
O
I
B
I
O
O
I
I
N
B
G
O
B
G
N
I
B
G
G
G
N
O
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