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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:

2010-04-01
19:30		[8332ceab30] Leaf removed old hosts (user: jrogers, tags: trunk)