Give a stream of consciousness and then the final answer. Context: The NSO is conducted on two levels each year. It was the first Olympiad to be conducted by SOF.It has been conducted since 1996. Students from class I-XII may participate in the examination.\n\nQuestion: how many levels are there in science olympiad?
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The relevant information to answer the above question is: The NSO is conducted on two levels each year.
So, the final answer is two levels.
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