Did a company employ M1 and M2 and employ a founder and employee of M3
SELECT count(*) WHERE {
?x0 a ns:business.employer .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x1 ns:organization.organization_founder.organizations_founded M3 .
?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M3
}