[
  [
    'Sort'
  ],
  [
    'Sort',
    'Nested Loop'
  ],
  [
    'Sort',
    'Nested Loop',
    'Seq Scan'
  ],
  [
    'Sort',
    'Nested Loop',
    'Materialize'
  ],
  [
    'Sort',
    'Nested Loop',
    'Materialize',
    'Seq Scan'
  ]
]