Which executive producer of M1 was a cinematographer that M2 and M3 employed
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.cinematographer .
?x0 ns:film.producer.films_executive_produced M1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3
}