Was M4 executive produced by a British film editor whose employer employed M2 and M3
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x0 ns:people.person.nationality ns:m.07ssc .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
M4 ns:film.film.executive_produced_by ?x0
}