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