Was a film director that M2 and M3 influenced and were influenced by M0
SELECT count(*) WHERE {
M0 a ns:film.director .
M0 ns:influence.influence_node.influenced M2 .
M0 ns:influence.influence_node.influenced M3 .
M0 ns:influence.influence_node.influenced_by M2 .
M0 ns:influence.influence_node.influenced_by M3
}