Were M3 and M4 executive produced by a person whose employer was founded by M1 and was founded by a actor
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x1 ns:organization.organization.founders ?x2 .
?x1 ns:organization.organization.founders M1 .
?x2 a ns:film.actor .
M3 ns:film.film.executive_produced_by ?x0 .
M4 ns:film.film.executive_produced_by ?x0
}