question: Was M2 a film whose prequel was produced by and was executive produced by M0 and M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.executive_produced_by M0 .
  ?x0 ns:film.film.executive_produced_by M1 .
  ?x0 ns:film.film.produced_by|ns:film.film.production_companies M0 .
  ?x0 ns:film.film.produced_by|ns:film.film.production_companies M1 .
  M2 a ns:film.film .
  M2 ns:film.film.prequel ?x0
  }