How do I delete pictures permanently from albums and library?

I've got a multi-part question... How do I permanently delete a picture from an album and have it automatically deleted from my library? That's the first part... and the easiest part!...

I might have a lot of pictures in one particular album... and then I've created other smaller albums with various pictures from some of the larger albums... then I want to delete a lot of pictures that I'm not interested in taking up any more space on my HD... So, I'd like to delete the larger albums and delete permanently from my library at the same time all those photos that AREN'T in ANY of the other smaller albums. I wouldn't want to delete permanently from my HD any of the photos that I organized into my smaller albums. So my question is... If I try to permanently delete the pictures in the larger albums (from both that album and the HD) and some of those pictures are also in other smaller albums, will the photos simultaneously be deleted from the smaller albums, as well?

If so, then how would I go about permanently deleting photos from both an album and the library that are already in various different places in various different albums. I would only want to delete permanently from the library those photos that AREN'T in any other current albums.

Along those same lines... Now that I've got a lot of pictures in different albums on iPhoto, how do I go about permanently deleting from the Library all those photos that currently aren't placed in any albums?

Thanks a lot,
Bill