The first format is the traditional format which, as you remember, looks like the following.
I. Topic
A. Subordinate topic
1. Item
2. Item
3. Item
B. Subordinate topic
1. Item
2. Item
II. Topic
A. Subordinate topic
1. Item
2. Item
3. Item
4. Item
B. Subordinate topic
1. Item
2. Item
C. Subordinate topic
1. Item
2. Item
3. Item
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