Yeah. It was a bit 50/50 on which duplicate I removed. 

Background was the use of https://osminedit.pavie.info to do indoor tagging; that site failed on upload but lets you download the changeset as geojson, which then failed to merge in JOSM. Mistakes were made. 

I'll do another round of cleanup to drop the extra tags. Main impact I see is loss of history on some of the elements on this one city block.  
