{
  "domain": "mathematics",
  "topics": [
    "graph-theory"
  ],
  "type": "construction",
  "also": [
    "proof"
  ],
  "source": {
    "key": "erdos",
    "name": "Erdős Problems",
    "url": "https://www.erdosproblems.com/128",
    "id": "128",
    "curator": "Thomas Bloom",
    "poser": "Paul Erdős and Cecil Rousseau",
    "status": "open, $250 prize",
    "as_of": "2026-10-20",
    "prize": "$250",
    "catalog": "0521c19bbd38"
  }
}