concepts:
  - id: c1
    title: Foundations
    description: Broad foundations topic with many ideas.
    prerequisites: []
    mastery_signals:
      - Explain core foundations.
  - id: c2
    title: Methods
    description: Methods concept with sparse explicit assessment.
    prerequisites: [c1]
    mastery_signals:
      - Use methods appropriately.
  - id: c3
    title: Advanced Inference
    description: Advanced inference topic.
    prerequisites: [c1, c2]
    mastery_signals:
      - Critique advanced inference.
  - id: c4
    title: Detached Topic
    description: Detached topic with no assessment coverage.
    prerequisites: []
    mastery_signals:
      - Explain detached topic.