Did a actor that M2 starred and M3 starred influence M1
SELECT count(*) WHERE {
?x0 a ns:film.actor .
?x0 ns:film.actor.film/ns:film.performance.film M2 .
?x0 ns:film.actor.film/ns:film.performance.film M3 .
?x0 ns:influence.influence_node.influenced M1
}