SELECT DISTINCT Q.n, Q.s
FROM sparqltable( SELECT ?z ?w ?n ?s
		  WHERE{ 	?x rdf:type 'AlreadyExtraction'.
			?x :Executor ?y.
			?y rdf:type 'Person'.
			?y :name ?n.
			?y :surname ?s.
			?y :Born ?z.
			?z rdf:type 'City'.
			?x :TakePlace ?w.
			?w rdf:type 'City'.			
         		                 }
	   )Q
WHERE Q.z = Q.w
