What film director that influenced M1 and M2 influenced M3 and was influenced by M4 , M5 , and M6
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.director .
?x0 ns:influence.influence_node.influenced M1 .
?x0 ns:influence.influence_node.influenced M2 .
?x0 ns:influence.influence_node.influenced M3 .
?x0 ns:influence.influence_node.influenced_by M4 .
?x0 ns:influence.influence_node.influenced_by M5 .
?x0 ns:influence.influence_node.influenced_by M6
}