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Mathematics
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WILL MEDAL AND FAN BEST ANSWER!!! Is the key for this correct?
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What you're asking is quite ambiguous / unclear. If you're given a "key," and it's really a "key," then you can assume it's correct. What, specifically, do you need to know? What have you done so far towards addressing this problem?
@mathmale I made the key, so I just wanted to make sure that when I said there was a universal set, there was, etc.
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