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m-submultisets and m-permutations of multisets elements. (arXiv:2009.01233v1 [math.GM]) http://arxiv.org/abs/2009.01233
m-submultisets and m-permutations of multisets elements. (arXiv:2009.01233v1 [math.GM]) http://arxiv.org/abs/2009.01233