I have the following overpass query

[bbox:{{bbox}}][diff:”2015-05-10T09:55:00Z”,”2015-05-15T10:00:00Z”];
(
way(user:”ABZ_OSM”);
);
out geom;

which you can also see here http://overpass-turbo.eu/s/Wk7 and shows any changes I have made in the bbox in the given date range.

I would like to enhance this query by showing every user change, except for changes made by me, in other words a boolean ‘not me’, or ‘not ABZ_OSM’?

I have tried lots of variants of !ABZ_OSM, and I think I have tried all the possibilities, though I may have by chance missed a working option.

Does anyone know how to do !ABZ_OSM (not ABZ_OSM)?

ps I know I can do this with www.OSMcha.org but I think being able to do this with a quick overpass query is easiear.