query: #title: P1448 required with exception for those installed 2015.
  # Complex constraint from [[Property talk:P776]]
  # A property P1448-constraint with an advanced exception.
  SELECT DISTINCT ?item ?n
  {
  	?item wdt:P776 ?value .
  	FILTER NOT EXISTS { ?item wdt:P1448 [] } .
    	OPTIONAL { ?item p:P31 [ ps:P31 wd:Q14839548; pq:P580 ?n ] }
    	FILTER ( !BOUND(?n) \u007C\u007C ?n < "2015-12-31T00:00:00Z"^^xsd:dateTime )
  }