query: embed.html##Dams without P4661 but with reservoirs within 1.5 km
  SELECT DISTINCT ?barrage ?barrageLabel ?lac ?lacLabel ?loc WHERE {
    ?barrage wdt:P31 wd:Q12323.
    ?lac wdt:P31 wd:Q131681.
    ?barrage wdt:P625 ?loc.
    SERVICE wikibase:around {
      ?lac wdt:P625 ?location.
      bd:serviceParam wikibase:center ?loc.
      bd:serviceParam wikibase:radius "1.5".
    }
    MINUS { ?barrage wdt:P4661 ?xxx }
    MINUS { ?yyy wdt:P4661 ?lac }
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en,fr,es,de,it". }
  }