{
  "challenge_module": "ComparatorChallenges.EvenBarker",
  "solution_module": "OAI.LinearAlgebra.Barker.Main",
  "theorem_names": [
    "OAI.CirculantHadamard.Barker.even_length_eq_two_or_four"
  ],
  "definition_names": [],
  "permitted_axioms": [
    "propext",
    "Classical.choice",
    "Quot.sound"
  ],
  "enable_nanoda": false
}