I don't understand why this question was closed? Especially why on grounds of being unclear? It was quite clear, was it not?

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    $\begingroup$ Well, several hints/questions in the comments went unremarked-upon by the OP and the question was not edited to clarify. At some level it was unclear what the OP was unclear about. $\endgroup$ – Jon Custer Feb 15 '18 at 15:13

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