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* Introduce new small transient DAG class. * Populate DAG on call to features, filtered on the chain(s) and other options * Change feture-grabbing to use this filtered sub-graph DAG * Include early-escape efficincies in this subsiquent navigation. * Aim to save substantial CPU in events with significant branching-merging-branching. * Both in sub-graph construction (instead of locating all linear routes). * And in sub-graph navigation (only explore from each node once)
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