query: SELECT ?item ?itemLabel ?series ?seriesLabel ?previous ?next WHERE {
    ?item wdt:P31 wd:Q21191270 .
    ?item wdt:P179 ?series . 
    MINUS {?item wdt:P345 [] } .
    OPTIONAL {?item wdt:P155 ?previous . }
    OPTIONAL {?item wdt:P156 ?next . }
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en" . }
    } ORDER BY ?seriesLabel