query: #title: Value "Niger" and place of birth in "Nigeria"
  # 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:Q1032|Niger <small>(Q1032)</small>]] -> [[d:Q1033|Nigeria <small>(Q1033)</small>]]
  SELECT DISTINCT ?item 
  { 
    ?item wdt:P27 wd:Q1032 .
    ?item wdt:P19/wdt:P17? wd:Q1033 .
    FILTER NOT EXISTS { ?item wdt:P27 wd:Q1033 }
    ?item wdt:P31 wd:Q5.
    ?item p:P27 ?claim .
    ?claim ps:P27 wd:Q1032 .
    OPTIONAL { ?claim prov:wasDerivedFrom ?source . ?source ?p ?v . FILTER NOT EXISTS { ?v wdt:P31 wd:Q10876391 } } 
    FILTER(!bound(?source)) 
  }