IX Which series of Science Fiction books do like the best?

This is part nine of the polls to find the most favored series. These choices were chosen from previous polls as the highest rated.

We are looking at a series of at least two or three books. There are many series out there and I could only list a few. I must admit that I have not read many of these. Especially non-English writers’ series. If you have others, not listed please put them in comments. I will publish the results after the poll closes.