Were M2 , M4 , M5 , and M6 edited by M1 's British editor and edited by M3
SELECT count(*) WHERE {
?x0 ns:film.editor.film M1 .
?x0 ns:people.person.nationality ns:m.07ssc .
M2 ns:film.film.edited_by ?x0 .
M2 ns:film.film.edited_by M3 .
M4 ns:film.film.edited_by ?x0 .
M4 ns:film.film.edited_by M3 .
M5 ns:film.film.edited_by ?x0 .
M5 ns:film.film.edited_by M3 .
M6 ns:film.film.edited_by ?x0 .
M6 ns:film.film.edited_by M3
}