READ_ONLY_ACCESS
[
  {
    "id": "ct-w06-000",
    "front": "Week 6 Diagnostic: In a dictionary / hash map, what is the expected time complexity to look up a value by its key?",
    "back": "Answer: A — Dictionaries provide O(1) average-time lookup by key via hash-based indexing."
  },
  {
    "id": "ct-w06-001",
    "front": "Week 6 Diagnostic: Can a dictionary have duplicate keys?",
    "back": "Answer: B — Dictionary keys are strictly unique. Reassigning to an existing key overwrites the previous value."
  }
]