{
  "seeded_perturbations": ["misspelling", "reordering", "synonym", "paraphrase"],
  "seeds": [1999, 5, 27, 2016, 2026],
  "unseeded_perturbations": {
    "naturality": "Deterministic transformation (stop-word removal). Produces identical output regardless of seed; represented in the TSV files with seed='deterministic' rather than being duplicated five times."
  }
}