question: Who married a cinematographer that M2 and M3 starred
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses ?x1 .
  ?x1 a ns:film.cinematographer .
  ?x1 ns:film.actor.film/ns:film.performance.film M2 .
  ?x1 ns:film.actor.film/ns:film.performance.film M3 .
  FILTER ( ?x0 != ?x1 )
  }