In an own map I have a special relation type which only makes sense with at least two members, one in the role ``left`` and one in the role ``right``. So to find critical relations it would be a good first approach to filter all relations with only one member. Is this possible, like ``tags:5-10``. ``tags:5-10``? My A little bit more advanced was my approach was to select all relations, and then remove the ones with this kind of member configuration: ``parent role:left child role:right parent``, but this expression seems to be odd (at least after the ``parent role:left`` part. Basic idea: * select all members in the role ``right`` * select their parents (=relations) * from those relations, select all children ``role=left`` * again, select their parents. Can someone there give me a hint?

In an own map I have a special relation type which only makes sense with at least two members, one in the role ``left`` and one in the role ``right``. So to find critical relations it would be a good first approach to filter all relations with only one member. Is this possible, like ``tags:5-10``. My approach was to select all relations, and then remove the ones with this kind of member configuration: ``parent role:left child role:right parent``, but this expression seems to be odd (at least after the ``parent role:left`` part. Basic idea: * select all members in the role ``right`` * select their parents (=relations) * from those relations, select all children ``role=left`` * again, select their parents. Can someone there give me a hint?