Were M2 and M4 founded by M3 and founded by a person that M1 employed and was founded by
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 M1 .
M2 ns:organization.organization.founders ?x0 .
M2 ns:organization.organization.founders M3 .
M4 ns:organization.organization.founders ?x0 .
M4 ns:organization.organization.founders M3
}