READ_ONLY_ACCESS
[
  {
    "id": "python-w07-000",
    "front": "Week 7 Diagnostic: Can a list be used as a key in a Python dictionary?",
    "back": "Answer: B — Dictionary keys must be hashable and immutable. Lists are mutable and unhashable, raising `TypeError: unhashable type: 'list'`."
  },
  {
    "id": "python-w07-001",
    "front": "Week 7 Diagnostic: What is the result of `len({1, 2, 2, 3, 3, 3})`?",
    "back": "Answer: 3 — Sets store only unique elements: `{1, 2, 3}` has length 3."
  }
]