question: Did a British film editor that edited and produced M1 and M2 found M3
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:film.editor.film M2 .
  ?x0 ns:film.producer.film|ns:film.production_company.films M1 .
  ?x0 ns:film.producer.film|ns:film.production_company.films M2 .
  ?x0 ns:organization.organization_founder.organizations_founded M3 .
  ?x0 ns:people.person.nationality ns:m.07ssc
  }