query: embed.html## Distribution of values of a property
  SELECT distinct ?pers1 ?pers1Label ?pers2 ?pers2Label ?pers3 ?pers3Label ?pers4 ?pers4Label ?pers5 ?pers5Label ?pers6 ?pers6Label
  WHERE {
    ?pers1 wdt:P157 ?pers2 .
    FILTER ( ?pers1 != ?pers2 )
    ?pers2 wdt:P157 ?pers3 .
    FILTER ( ?pers1 != ?pers3 )
    FILTER ( ?pers2 != ?pers3 )
    ?pers3 wdt:P157 ?pers4 .
    FILTER ( ?pers1 != ?pers4 )
    FILTER ( ?pers2 != ?pers4 )
    ?pers4 wdt:P157 ?pers5 .
    FILTER ( ?pers1 != ?pers5 )
    ?pers5 wdt:P157 ?pers6 .
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }