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