How to join solids without seaming edge

After boolean union two solid surfaces, i get a seaming line. Could you please tell me how to get rid of the seaming edge?
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Hello - try MergeAllCoplanarFaces does that do it?

-Pascal

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This command does not appear on rhino 6. I found MergeAllFaces. It worked fantastically!

the name has been changed in rhino 7

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