Was a company acquired by M3 's employer , acquired by M1 , and acquired by M2
SELECT count(*) WHERE {
?x0 a ns:business.employer .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company ?x1 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M1 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M2 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M3
}