Did a film editor write M1 , M2 , and M3 , write M4 , and write M5 and M6
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.writer.film M1 .
?x0 ns:film.writer.film M2 .
?x0 ns:film.writer.film M3 .
?x0 ns:film.writer.film M4 .
?x0 ns:film.writer.film M5 .
?x0 ns:film.writer.film M6
}