What film producer that M1 employed was a editor of M2 , M3 , M4 , M5 , and M6
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.producer .
?x0 ns:film.editor.film M2 .
?x0 ns:film.editor.film M3 .
?x0 ns:film.editor.film M4 .
?x0 ns:film.editor.film M5 .
?x0 ns:film.editor.film M6 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1
}