Some of books 4 and 5 will be in next year along with the end of book 3 (heck, some has already been in this season with Theon), and they could do the rest of book 4 and 5 for season 5. That puts them back on pace for 7, but something tells me book 6 will take more than one season to cover, and book 7 could as well. Would not surprise me if it went 8 or 9 seasons if the ratings hold, which they probably will given how many people have now read the books.
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