query: 
  SELECT ?item ?LabelEN ?LabelNL WHERE {
    ?item wdt:P31 wd:Q13442814;
           rdfs:label ?label.
    ?item rdfs:label ?LabelEN filter (lang(?LabelEN) = "en") .
    ?item rdfs:label ?LabelNL filter (lang(?LabelNL) = "nl") .
  
    FILTER(STRSTARTS(?LabelEN, ?LabelNL)).
    FILTER(REGEX(?LabelEN, "\\(.+\\)")).
    FILTER(REGEX(?LabelNL, "^[^\\(\\)]+$")).
  }
  ORDER BY (?itemLabel)
  LIMIT 50