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What I like about it is that you can "fold" children up into the preceding level. I have an outline for environmental law that I started in OO's predecessor, MORE II, over 20 years ago. It is certainly over 3,000 pages with at least 30 "level 1's". But it is easy to find topics in the middle, copy out of it to create an outline of subsets, create handout materials, etc.

It is my memory. My file cabinet.