Did a person whose employer was founded by and employed M2 and M3 found M1
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:organization.organization_founder.organizations_founded M1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
?x1 ns:organization.organization.founders M2 .
?x1 ns:organization.organization.founders M3
}