Who was a art director that M2 , M3 , and M4 were influenced by and M5 and M6 were influenced by
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film_art_director .
?x0 a ns:people.person .
?x0 ns:influence.influence_node.influenced M2 .
?x0 ns:influence.influence_node.influenced M3 .
?x0 ns:influence.influence_node.influenced M4 .
?x0 ns:influence.influence_node.influenced M5 .
?x0 ns:influence.influence_node.influenced M6
}