giles
b4c1253891
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Defines a small graph as a fact list, edgeo for fact lookup, and patho
that recursively constructs paths. Direct-edge clause yields (x y);
otherwise traverse one edge to z, recurse for z->y, prepend x.
Enumerates all paths between two nodes, including alternates through
shortcut edges:
(run* q (patho :a :d q))
-> ((:a :b :c :d) (:a :c :d)) ; both routes
6 new tests, 316/316 cumulative.