question: Was a person a character that M2 and M3 were executive produced and written by
query: SELECT count(*) WHERE {
  ?x0 a ns:fictional_universe.fictional_character .
  ?x0 a ns:people.person .
  ?x0 ns:film.producer.films_executive_produced M2 .
  ?x0 ns:film.producer.films_executive_produced M3 .
  ?x0 ns:film.writer.film M2 .
  ?x0 ns:film.writer.film M3
  }