On the Closure of Subsets of {4, 5, ..., 9} which contain {4}

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@article{Mullin1997OnTC, title={On the Closure of Subsets of \{4, 5, ..., 9\} which contain \{4\}}, author={Ronald C. Mullin and Alan C. H. Ling and R. Julian R. Abel and Frank E. Bennett}, journal={Ars Comb.}, year={1997}, volume={45} }