Were M3 and M6 executive produced by M4 and M5 and executive produced by a film editor that played M1 and M2
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.actor.film/ns:film.performance.character M1 .
?x0 ns:film.actor.film/ns:film.performance.character M2 .
M3 ns:film.film.executive_produced_by ?x0 .
M3 ns:film.film.executive_produced_by M4 .
M3 ns:film.film.executive_produced_by M5 .
M6 ns:film.film.executive_produced_by ?x0 .
M6 ns:film.film.executive_produced_by M4 .
M6 ns:film.film.executive_produced_by M5
}