question: Did M3 marry M2 's female German art director
query: SELECT count(*) WHERE {
  ?x0 ns:film.film_art_director.films_art_directed M2 .
  ?x0 ns:people.person.gender ns:m.02zsn .
  ?x0 ns:people.person.nationality ns:m.0345h .
  FILTER ( M3 != ?x0 ) .
  M3 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses ?x0
  }