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Random Walk On The Integers

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Imagine you are on a number line, stood initially on 0. You flip a fair coin and every time you get a heads you move up one number in the positive direction. Every time you get a tails you move down one. This programme draws a graph of that movement with the horizontal white line in the centre of the screen being 0. (For visual effect, this programme is actually running on the integers mod 80)
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