query: SELECT DISTINCT ?item ?itemLabel ?mainsubject ?mainsubjectLabel WHERE {
    ?item wdt:P31 wd:Q3305213 .  
    ?item wdt:P1257 ?iconclass .
    MINUS { ?item wdt:P921 [] } .
    ?item2 wdt:P1257 ?iconclass .
    ?item2 wdt:P136 wd:Q2864737 .
    ?item2 wdt:P921 ?mainsubject .
    ?mainsubject wdt:P31 wd:Q1406161 .
    ?mainsubject wdt:P1256 ?iconclass .
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
    }  LIMIT 20000