Removes duplicate or overlapping lines, arcs, and polylines. Also, combines partially overlapping or contiguous ones.
Access Methods
Button
Toolbar: Drafting tool set 
Explode tool set Delete Duplicate Objects Menu:
Modify
Delete Duplicate Objects
Summary
Displays the Delete Duplicate Objects dialog box.
Removes redundant geometry.
- Duplicate copies of objects are deleted
- Arcs drawn over portions of circles are deleted
- Lines, partially overlapping, drawn at the same angle are combined into a single line
- Duplicate line or arc segments overlapping polyline segments are deleted
If you enter -overkill at the Command prompt, options are displayed.