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rogerl

Welcome to math.SE. A couple of comments on your post: first, the title should describe the problem you are looking to solve. Second, you should use MathJax to format your question. Finally, if you have made any attempts to solve the problem on your own, please tell us what you've tried. That way we can give you help that addresses whatever problem you are having.

(Please feel free to use this if you'd like.)

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