1 Erratum
In the original published version of this article [1], the authors’ affiliation address was incorrectly listed as follows:
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College of Mathematics and Information Science, 46 East of Construction Road, Xinxiang 453007, Henan, P.R. China
The correct affiliation address for the authors is
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College of Mathematics and Information Science, Henan Normal University, Xinxiang 453007, P.R. China
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