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  1. +-- Item -----
  2. | id: ℕ
  3. | name: String
  4. | price: ℝ
  5. | category: String
  6. |----
  7. | price ≥ 0
  8. +----------
  9.  
  10. +-- Database -----
  11. | items: ℕ +-> Item
  12. |----------
  13.  
  14. +-- Items -----
  15. | ids: ℕ
  16. | name: ids --> String
  17. | price: ids --> ℝ
  18. | category: ids --> String
  19. +----------
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