{
  "name": "golomb_n9__v2_nh",
  "problem_type": "golomb",
  "params": {
    "n": 9
  },
  "prompt": "Find a Golomb ruler with 9 marks. A Golomb ruler is a set of 9 integers (marks) such that all pairwise distances between marks are unique. The first mark should be at position 0.\n\nReturn a list of 9 integers in increasing order representing the mark positions, or state \"UNSATISFIABLE\" if no solution exists.",
  "satisfiable": true,
  "solution": {
    "x": [
      0,
      1,
      5,
      12,
      25,
      27,
      35,
      41,
      44
    ]
  },
  "difficulty": {
    "solve_time_ms": 4578.6,
    "search_space": 167619550409708032,
    "num_variables": 9,
    "num_constraints": 5,
    "num_edges": -1,
    "backend": "pycsp",
    "solve_tier": "hard",
    "solve_pct_global": 97.18,
    "solve_pct_type": 75.0
  },
  "partial_assignment": null
}