Sat, 25 Jul 2009 14:58:45 +0200 wenzelm dequeue_towards: need to try imm_preds as well;
Sat, 25 Jul 2009 14:32:35 +0200 wenzelm internal session timing;
Sat, 25 Jul 2009 14:18:26 +0200 wenzelm enqueue: maintain transitive closure, which simplifies dequeue_towards;
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