Did M2 star M1 's spouse and star a writer of M0
SELECT count(*) WHERE {
?x0 ns:film.writer.film M0 .
?x1 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses M1 .
FILTER ( ?x1 != M1 ) .
M2 ns:film.film.starring/ns:film.performance.actor ?x0 .
M2 ns:film.film.starring/ns:film.performance.actor ?x1
}