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This paper was written while the author was visiting at the university of Alberta in Edmonton.
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Erdős, P. On a combinatorial problem. II. Acta Mathematica Academiae Scientiarum Hungaricae 15, 445–447 (1964). https://doi.org/10.1007/BF01897152
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DOI: https://doi.org/10.1007/BF01897152