Was M2 founded by a screenwriter , founded by a sibling of a film editor , and founded by M3 and M4
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x1 ns:people.person.sibling_s/ns:people.sibling_relationship.sibling|ns:fictional_universe.fictional_character.siblings/ns:fictional_universe.sibling_relationship_of_fictional_characters.siblings ?x2 .
?x2 a ns:film.editor .
FILTER ( ?x1 != ?x2 ) .
M2 ns:organization.organization.founders ?x0 .
M2 ns:organization.organization.founders ?x1 .
M2 ns:organization.organization.founders M3 .
M2 ns:organization.organization.founders M4
}