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Iffy Logic
Age 14 to 18
Challenge Level 
Some cards could be paired up with more than one possible partner.
See if you can identify cards which have an obvious partner or only match up with one other possibility (such as the two involving Rover).
There are 6 cards which involve both $n$ and $m$ - can you pair these up?
Don't forget that $n$ and $m$ are both positive integers!
