thanks for that. I am having trouble understanding it...It worked when I drew thre lines over top of one another....I got a boolean pattern I could use. But in a file with 300+ curves with many duplicates it's not fairing as well. It looks like you are just shifting the list and comparing each line to the one adjacent to it in the list - is that right? that doesn't work in my scenario. I was trying to write a script to do this which would have an outer and inner for loop cycling through each line and comparing its start and end vertices but I didn't get very far....I imagine that implementing your idea of an identifiable key and the two loops - comparing each piece to every other piece - would work....now how to do it, is another things I guess....
thanks for the help
