Was M1 founded by M2 , M3 , and M4 and founded by a film editor
SELECT count(*) WHERE {
?x0 a ns:film.editor .
M1 ns:organization.organization.founders ?x0 .
M1 ns:organization.organization.founders M2 .
M1 ns:organization.organization.founders M3 .
M1 ns:organization.organization.founders M4
}