query: SELECT DISTINCT
    (SAMPLE(COALESCE(?en_label, ?item_label)) as ?name)
    (SAMPLE(?item) as ?wikidata)
  WHERE {
    ?item wdt:P279* wd:Q10943.
    OPTIONAL {?item rdfs:label ?en_label. FILTER(LANG(?en_label) = "en")} OPTIONAL {?item rdfs:label ?item_label}
    MINUS { 
      ?item wdt:P186 ?material. ?material rdfs:label ?material_label . FILTER(LANG(?material_label) = "en")
      ?material wdt:P279* wd:Q8495.
    }
    ?item wdt:P186 ?material.
  } GROUP BY ?item ORDER BY ASC(?label)