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From my perspective, there are two main plotlines that are still out there that COULD end up being in the show: one that book readers will recognize as LSH, and a lot of story about the Greyjoy family that has thus far been completely left out of the show. In addition, there is a little action in Old Town still, as well as a little bit of Arya being blinded, though I honestly think both of those are pretty low risk in terms of MAJOR spoilers.
However, there's years of theories about what's going to happen in the future based off of events that are in the books which are similar, but not identical, to the show. Those can possibly be considered spoilers, though they're not necessarily concrete.
So to me, the big questions are:
1. Do show watchers at this point WANT to know more about the context that can be provided by the books? And are you willing to risk something showing up later that you knew about to get it?
2. Are book readers willing to use spoiler tags for stuff like LSH and the Greyjoys just in case they show up?
That said, I barely remember half of what's in the books at this point, so there may be more in there that's important than I'm remembering.
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