query: SELECT ?item ?nr_s ?nr_e ?nr_all ?release (GROUP_CONCAT(DISTINCT(?enlabel)) as ?enlabels) WHERE 
  {  
    ?item wdt:P31 wd:Q21191270 .
    ?item wdt:P179 wd:Q2316316 .   
    ?item wdt:P4908 ?season .
    ?item wdt:P577 ?release .
    ?season p:P179 ?season_statement .
    ?season_statement pq:P1545 ?nr_s  .
    ?item p:P4908 ?episode_statement .
    ?episode_statement pq:P1545 ?nr_e  .
  OPTIONAL {
    ?item p:P179 ?series_statement .
    ?series_statement pq:P1545 ?nr_all  .
  }
    OPTIONAL { ?item rdfs:label ?enlabel . FILTER(lang(?enlabel)="en")  } 
  } GROUP BY ?item ?nr_s ?nr_e ?nr_all ?release ORDER BY ?release