Was M0 's child M1 's sequel 's editor
SELECT count(*) WHERE {
?x0 ns:film.editor.film ?x1 .
?x0 ns:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent M0 .
?x1 ns:film.film.prequel M1
}