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  "submitter": "David Renshaw",
  "created_at": "2026-10-05 14:48:44",
  "comments": [
    {
      "author": "David Renshaw",
      "created_at": "2026-10-05 14:48:44",
      "content": "Found by beam search over prefixes scored by randomized DFS rollouts (from scratch, 4 min), then two rounds of iterated cut-and-re-extend local search on both ends (~14 min, 10 cores)."
    }
  ]
}