i1:
  id: 1
  tag_ids: [ 1 ]
i2:
  id: 2
  tag_ids: [ 3 ]
i3:
  id: 3
  tag_ids: [ 1, 3 ]
i4:
  id: 4
  tag_ids: [ 3, 1 ]
i5:
  id: 5
  tag_ids: [ 1, 2 ]
i6:
  id: 6
  tag_ids: [ 1, 2, 3 ]
i7:
  id: 7
  tag_ids: [ ]