Was M2 written by M1 's writer , written by M0 's writer , and executive produced by M3
SELECT count(*) WHERE {
?x0 ns:film.writer.film M0 .
?x1 ns:film.writer.film M1 .
M2 ns:film.film.executive_produced_by M3 .
M2 ns:film.film.written_by ?x0 .
M2 ns:film.film.written_by ?x1
}