Did M1 , M2 , M3 , and M4 employ M0 's founder
SELECT count(*) WHERE {
?x0 ns:organization.organization_founder.organizations_founded M0 .
M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M4 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}