What is the question to: "In the United Kingdom , the return address is usually placed on the reverse of the envelope, near the top."? The topic is Return address.
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Answer: "where does the return address go on mail?"

What is the question to: "The highest point is Mt. Ka'ala in the Waianae Range, rising to above sea level."? The topic is Oahu.
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Answer: "what is the highest point in oahu?"

What is the question to: "The bag itself was made up of different animal hide and skin (depending on what sorts of animals were in the area) and sewn together by the intestines of said animals, which were woven together tightly to make a sturdy thread-like material."? The topic is Backpack.
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Answer:
"how is a backpack made?"