Help me create LISP routine to remove duplicates!

Ok before anything else please bare with me on this one,

the file i uploaded is just a super tiny part of my workload for this month

the yellow polylines are extracted from MapInfo. the problem is, its polyline! so when i explode it to make it into lines, it becomes 2 lines.

While on the original data, which is the reds and blacks all are LINES..

thats only one problem...

2nd problem is, lines are not Exact overlap so i can't use OVERKILL command to remove those duplicates! and i have massive lines exactly like the file i uploaded, and im out of ideas on how i will remove these overlap lines and polylines

please anyone?? i really need a miracle here

needstoDELETE overlaps.dwg

Can this links help you?

http://www.cadtutor.net/forum/showthread.php?62364-Help-Select-duplicate-entities

http://www.cadtutor.net/forum/showthread.php?83657-I-need-overkill-and-ncopy-!please-help-me!/page3&p=#27

http://www.ellenfinkelstein.com/acadblog/remove-duplicate-and-overlapping-objects/

gr. Rlx

Did you try setting a fuzz factor in OVERKILL?

It worked here on your sample .dwg.

As it seems to cause you grief why explode the polylines? Besides the Join command and Overkill's Optimize segments within polylines there's plenty of lisp out there for weeding polyline vertices. I've modified Overkill's settings in lisp routines to make sure it does what I want it to.