@misc{BLZ2026,
      author = {Michael Beeson and Mikl{\'o}s Laczkovich and Yan X. Zhang},
      title  = {Solution of {E}rd{\H{o}}s Problem 633},
      year={2026},
      eprint={2604.03609},
      archivePrefix={arXiv},
      primaryClass={math.CO},
      url={https://arxiv.org/abs/2604.03609}, 
}

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