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The query
PREFIX mc: <https://w3id.org/rete/memoria/ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?province ?victims ?graves WHERE {
{ SELECT ?p (COUNT(?v) AS ?victims) WHERE { ?v mc:bornInProvince ?p } GROUP BY ?p }
{ SELECT ?p (COUNT(?g) AS ?graves) WHERE { ?g mc:province ?p } GROUP BY ?p }
?p rdfs:label ?province .
} ORDER BY DESC(?graves) LIMIT 20