I really can't recall the most complicated data structure that i have beaten up worked with off hand, i just would like to comment about Data::Dumper. I always use it when dealing with data structures. Always! :)

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)