Was M2 executive produced by a film editor , edited by M3 , and executive produced by M1 's editor
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x1 ns:film.editor.film M1 .
M2 ns:film.film.edited_by M3 .
M2 ns:film.film.executive_produced_by ?x0 .
M2 ns:film.film.executive_produced_by ?x1
}