RELATIVE
DATING
O
B
B
I
I
I
B
G
O
I
G
O
N
B
B
N
N
N
O
N
O
I
G
G
G
Size:
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Start
O
History
Start
O
B
B
I
I
I
B
G
O
I
G
O
N
B
B
N
N
N
O
N
O
I
G
G
G
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