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The second author's work was partially supported by Hungarian National Foundation for Scientific Research Grant No. 1801.
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Erdős, P., Vértesi, P. On certain saturation problems. Acta Math Hung 53, 197–203 (1989). https://doi.org/10.1007/BF02170070
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DOI: https://doi.org/10.1007/BF02170070