Rotate
180°about
the origin
N
G
B
N
O
G
N
O
O
B
G
B
B
I
I
G
B
O
I
O
I
N
I
G
Size:
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Start
N
History
Start
N
G
B
N
O
G
N
O
O
B
G
B
B
I
I
G
B
O
I
O
I
N
I
G
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