query: #title: Value "Samoa" and place of birth in "American Samoa"
  # Complex constraint from [[Property talk:P27]]
  # Possible, but likely an error. TODO: double-check, then add a reference to the P27 statement or fix P27=[[d:Q683|Samoa <small>(Q683)</small>]] -> [[d:Q16641|American Samoa <small>(Q16641)</small>]]
  SELECT DISTINCT ?item 
  { 
    ?item wdt:P27 wd:Q683 .
    ?item wdt:P19/wdt:P131* wd:Q16641 .
    FILTER NOT EXISTS { ?item wdt:P27 wd:Q16641 }
    ?item wdt:P31 wd:Q5.
    ?item p:P27 ?claim .
    ?claim ps:P27 wd:Q683 .
    OPTIONAL { ?claim prov:wasDerivedFrom ?source . ?source ?p ?v . FILTER NOT EXISTS { ?v wdt:P31 wd:Q10876391 } } 
    FILTER(!bound(?source)) 
  }