Was M1 written by a company , executive produced by M2 , executive produced by M3 , and executive produced by M4
SELECT count(*) WHERE {
?x0 a ns:business.employer .
M1 ns:film.film.executive_produced_by M2 .
M1 ns:film.film.executive_produced_by M3 .
M1 ns:film.film.executive_produced_by M4 .
M1 ns:film.film.written_by ?x0
}