question: What film producer did a employee of M1 and M2 found
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.producer .
  ?x0 ns:organization.organization.founders ?x1 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M2
  }