subtract
seven from
twenty-one
O
B
G
I
B
N
G
I
O
G
N
N
O
G
I
B
I
O
B
G
I
B
O
N
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Start
O
History
Start
O
B
G
I
B
N
G
I
O
G
N
N
O
G
I
B
I
O
B
G
I
B
O
N
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