What is {position held} of {Jean Chrétien} that is {replaced by} is {Gerald Regan} ?
Jean Chrétien was replaced by Gerald Regan in what position?
What position did Jean Chrétien hold before being replaced by Gerald Regan?
SELECT ?h WHERE { resource:Jean_Chrétien property:position_held ?c . ?c property:position_held ?h . ?c property:replaced_by resource:Gerald_Regan }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q128543> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P39> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P1366> <http://wikidata.dbpedia.org/resource/Q247524>
} 

SELECT ?obj WHERE { wd:Q128543 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P1366 wd:Q247524 }