query: #title: Qualifier for none-of constraint and conflicts-with constraint
  # Complex constraint from [[Property talk:P6824]]
  # This qualifier is generally used for [[d:Q52558054|none-of constraint <small>(Q52558054)</small>]] or [[d:Q21502838|conflicts-with constraint <small>(Q21502838)</small>]]. TODO: double-check
  SELECT ?item ?constraint ?rep
  {
      ?item p:P2302 [ pq:P6824 ?rep ; ps:P2302 ?constraint ]
      FILTER( ?constraint != wd:Q52558054 )    
      FILTER( ?constraint != wd:Q21502838 )
  }