Hi Doug: /course/com3362/sp99/DJ/simple-example My students might be confused by the name changes to the parts: b -> fb etc. Is this documented somewhere. If not, I need to explain it in class. Please can you provide the rationale again. -- Karl begin before A before B before D after D after B after A end Traversal Graph for from A to D Nodes: A: in copies {0} D: in copies {0} B: in copies {0} Edges: -> A,fb,B: in copies {0} -> B,fd,D: in copies {0}