Bookmarks are never stored more than once inside of a WebLynx document. That's not to say a bookmark cannot be in more than one folder, or have more than one tag, it just means that adding the same bookmark twice, or ten times, results in only one entry in the file.
The job of cleaning up duplicate bookmarks in WebLynx then simply becomes the job of cleaning up the number of locations a bookmark has, and this can be done with elegant ease.
Finding Duplicate Links in a WebLynx Document
With an open WebLynx document, use the left hand panel to open the "Multiple Folders" view, by clicking on the "Views" section and selecting the "Multiple Folders" view. This will show all the bookmarks that are located in more than one folder.
In general there is nothing special about this view, apart from one special ability to help remove duplicates:
On a per bookmark basis, bookmarks can also be edited, to remove duplicate folders.
Easy as that.