Was a character that was employed by M2 and M3 a screenwriter
SELECT count(*) WHERE {
?x0 a ns:fictional_universe.fictional_character .
?x0 a ns:film.writer .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3
}