Gone

In June, I uploaded some of my photos taken in Malacca to Flickr. I added those photos into a Set named Malacca. Ironically, the set is now gone. I really wonder how the set disappear. I believe that only me is allowed to delete the set if I want to. I manage to find them when I search using tags but the set is just gone under my account. If I delete the set, will the photos still remain in Flickr repository?

I still couldn't figure it out.


Update: Finally, I found out why the photos are gone. I have reached the limit of free account. Only 200 most recent images will be displayed in the view photostream. I would need to upgrade to Pro account to let the old photo appears again.