Did a company that M4 acquired and was acquired by employ M1 and employ M2 and M3
SELECT count(*) WHERE {
?x0 a ns:business.employer .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M4 .
?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M4
}