reviews:
  product1:
    - reviewer1
    - reviewer2
    - reviewer3
    - reviewer7
  product2:
    - reviewer1
    - reviewer2
    - reviewer4
    - reviewer8
  product3:
    - reviewer3
  product4:
    - reviewer4
    - reviewer7
  product5:
    - reviewer5
    - reviewer8
  product6:
    - reviewer6