Was a film director influenced by M3 , influenced by M4 , and influenced by a person M1
SELECT count(*) WHERE {
?x0 a ns:people.person .
M1 a ns:film.director .
M1 ns:influence.influence_node.influenced_by ?x0 .
M1 ns:influence.influence_node.influenced_by M3 .
M1 ns:influence.influence_node.influenced_by M4
}