A man is traveling somewhere. There has four corners: A, B, C and D. Each time he travels from one corner
to the next, he is not allowed to go back to the corner it came from. If it
travels from corner A to corner B, then it cannot go back to A as the next
travel. Lets say it starts the travels from corner A, what is the probability of
it going back to A the first time at the 7th travel?
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