On Tuesday, January 7, 2014 6:29:11 AM UTC-6, Edward K. Ream wrote:

> Computing the source unl [of an organizer node] is similar to computing 
the raw unl, but the computation drops the tail of the unl only until a 
non-organizer part is seen.

I was confused.  In fact, the source unl of an organizer node O is 
self.drop_unl_tail(self.drop_all_organizers_in_unl(O))

> There is also an ever-present complication: moving nodes into an 
organizer node has the potential to invalidate previously-computed 
positions.

In general, the way around all such problems is to process nodes in a 
depth-first manner.  This preserves the validity of all positions while 
they are being used.

EKR

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