Were M2 and M4 founded by a film editor , founded by M3 , and founded by a film producer
SELECT count(*) WHERE {
?x0 a ns:film.producer .
?x1 a ns:film.editor .
M2 ns:organization.organization.founders ?x0 .
M2 ns:organization.organization.founders ?x1 .
M2 ns:organization.organization.founders M3 .
M4 ns:organization.organization.founders ?x0 .
M4 ns:organization.organization.founders ?x1 .
M4 ns:organization.organization.founders M3
}