If you're processing a graph, and your data structure holds nodes, and your 
processing processes arcs, you really need to have a previous, current, and 
next node.

Just having the previous and next node in your step of figuring out where 
you're going will not work.

-- 
Darren New, San Diego CA, USA (PST)
   Yes, we're traveling together,
   but to different destinations.

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