Was M3 employed by a company that acquired M1 and M2
SELECT count(*) WHERE {
?x0 a ns:business.employer .
?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M1 .
?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M2 .
M3 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0
}