Was M0 a film editor that was employed by M2 and M3 and was employed by M4
SELECT count(*) WHERE {
M0 a ns:film.editor .
M0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
M0 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
M0 ns:people.person.employment_history/ns:business.employment_tenure.company M4
}