Looks the same turned sideways or upside down: I was thinking about Japan and Bangladesh, but does this mean that you turn it only 90 degrees, not 180 degrees. Sorry if its stupid questin, I'm not English speaker.
Technically, the Saudi flag has a 7-word arabic sentence written on it. Only when you translate it to English does it become 12 words. It's a bit confusing to be honest, because even if you didn't speak Arabic and you look at the flag you won't see a 12-word sentence, only uncomprehensible scibbled writing, so I don't see how you can guess that answer. Maybe change the clue?
Clue updated, thanks. The red/black/green version is still flown at international sporting events, so I'm not convinced yet that the new black-and-white one counts as "official" yet.
Dominica isn’t quite unique in that respect: Nicaragua also has purple at the bottom of the rainbow at the top of the coat of arms in the middle of the flag.
Also, if the answers are meant to be in alphabetical order, there's some mix-up at S.