abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ ☹☹☹ Empty group ! ☹☹ Duplicate group will be merged. ☹☹☹ Empty category ! ☹☹ Duplicate environment will be merged. ☹☹ Duplicate category will be merged. ☹☹☹ Ignoring duplicate reference to in group . ⇒ Only its first reference ( package) will be kept. ☹ Ignoring duplicate reference to group in category .