Was M1 's American female British writer a film editor
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.writer.film M1 .
?x0 ns:people.person.gender ns:m.02zsn .
?x0 ns:people.person.nationality ns:m.07ssc .
?x0 ns:people.person.nationality ns:m.09c7w0
}