I'm Truly struggling to comprehend if I must use "a" or "a single" while in the under example. This can be derived from Yet another thread that became also bewildering with the wrong examples. Thanks for any direction. Some people may perhaps argue that "All those" refer to "specific types", https://thesocialintro.com/story5599080/the-ultimate-guide-to-one-tv-p2p-assinatura-garantida