question: Did M3 , M4 , and M5 employ a film editor employed by M1 and employed by M2
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
  M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M4 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M5 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
  }