[Hat] Cycles

Hi, I was just wondering if anyone had a 'definitive' list of where it is possible to get a cycle in an ART. Has anyone looked at where it is theoretically possible to get a cycle and what code causes it? Or, if not, does anyone have a list simply from the experience of writing the SExp cycle detection code – I'm having a few problems deciphering exactly what it is looking for. Thanks Tom Davie -- What is the internet? It's the largest equivalence class in the reflexive transitive symmetric closure of the relationship "can be reached by an IP packet from". -- Seth Breidbart