A_n=\left\{ \begin{array}{ll} (-\infty,\mu_{n_k}] & (n=n_k,\mu_{n_k}<0)\\ (\mu_{n_k},\infty) & (n=n_k, \mu_{n_k}\geq 0)\\ (n,\infty) & (n\neq n_k)\\ \end{array} \right.
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