i copied a group of lines on top of another group. these have dozens of little lines that are on the same layer, same color, same everything, and they are all directly on top of the lines from another group. i can not delete just the group, because i need some linework from one group and some from the other, and where the little lines are exactly overlapping i need to only keep one or the other of those ones. in microstation there’s a tool simply called “remove duplicates” and it has a little broom sweep icon. i know rhino 6 has a similar tool but i have typed several things into the command line and nothing is showing up. i also can’t find any forum posts about it because i dont even know what word i’m supposed to be searching. i wish all software could agree on a standard terminology 
anyway, does anyone know what the tool is called or what term i need to search for on mcneel forums to find this tool that deletes any lines that have the exact same geometry and coordinates and layer and color etc? thanks.
The command SelDup will select exact duplicates, leaving one copy unselected. SelDupAll will select all of the duplicate objects. You can then do what you want, i.e. Delete, etc.
That being said, neither of those commands cares about layer, color, grouping or any other object attribute - it just looks at the geometry. So with SelDup, you never know which object is the one left unselected.
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thank you! thats exactly it! i was just one word off.