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To have a middle step, there must be an odd number of steps, such that

For x steps, (x-1)/2 is the number of steps up to the top.

(x-1)/2 = - 2 + 4 - 3 + 5 yields

(x-1)/2 =4 / x-1 =8 / x = 9

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Nine.
____ Up five
____
____ Up four
____
____ Middle
____ Down three
____ Down two
____
____

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