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Nomenclature:

A leaf is a check-in with no descendants.
An open leaf is a leaf that does not have a "closed" tag and is thus assumed to still be in use.
A closed leaf has a "closed" tag and is thus assumed to be historical and no longer in active use.

Open leaves:

2008-05-27
13:32:38	*	[7343cab627] Leaf minor cleanup (user: stephan)
2008-01-17
18:36:25	*	[511d7b57a3] Leaf double-checking my understanding of the copy semantics (user: stephan, tags: trunk)