query: SELECT ?statement ?hasDuplicate ?hasReference WHERE {
    ?human wdt:P31 wd:Q5;
      p:P31 ?statement.
    ?statement ps:P31 ?o.
    ?o (wdt:P31/(wdt:P279*)) wd:Q12737077.
    OPTIONAL {
      ?human p:P106 ?duplicateStatement.
      ?duplicateStatement ps:P106 ?o.
    }
    OPTIONAL { ?statement prov:wasDerivedFrom ?reference. }
    BIND(BOUND(?duplicateStatement) AS ?hasDuplicate)
    BIND(BOUND(?reference) AS ?hasReference)
    #TODO: qualifiers?
  }
  LIMIT 100