Starting from A, I can either go up, straight or down, but I won't be at B
Being at the top or at the bottom, there are two possibilities, on the outer ring or back to the middle --> 4
Being in the middle, only up or down is possible (otherwise I would end up at B within 2) --> 2
So I have to add the 4 and 2 --> 6 --> C
Being at the top or at the bottom, there are two possibilities, on the outer ring or back to the middle --> 4
Being in the middle, only up or down is possible (otherwise I would end up at B within 2) --> 2
So I have to add the 4 and 2 --> 6 --> C
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