query: #title: A factor should be listed just once
  # Complex constraint from [[Property talk:P5236]]
  # Use qualifier "quantity" instead
  SELECT ?item ?factor
  {
        hint:Query hint:optimizer "None".
        ?item p:P5236 ?st1 . ?st1 ps:P5236 ?factor .
        ?item p:P5236 ?st2 . ?st2 ps:P5236 ?factor .
        FILTER( ?st1 != ?st2 )
  }
  LIMIT 100