Q: Is each list a combination of new urls plus old lists or is each list unqiue?
A: Each list is largely unique, although there may be some bleed over between lists. However from time to time I go thru and refilter the lists into Master Lists, which are marked as such.
Q: What is a Master List?
A: A master list is a combination of all prior posted lists, re-filtered down to the ones that are still live.