More than one 는/은 per sentence?
When I read things in Korean a lot of times I notice that a single sentence will have more than one 는/은 in it: how is this possible? I thought that every sentence could only have one topic?

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FWIW, I've always found that name of "Topic marker" to be confusing. It helps me to think of it as an implied contrast, or else as being the same as where I could use "As for" in English. It can come in places where you would have seen 를 or 을 when there is an implied contrast or comparison in that place even.

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One way it can happen is with contrasts such as you will find with compound sentences separated with 는데.