Level thinking - how good you are?

[uuser]

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P.S. Here is a problem for you. A dog was trained to wave it's tale when it sees another dog that isn't waving it's tale, and vise-versa. So what happens when you put that dog in front of a mirror?

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The dog thinks that the dog in the mirror thinks that the real dog thinks that the dog in the mirror thinks that the real dog does not compute, gets embarassed and falls on the floor waving it's head at the same time.