Did M2 and M3 acquire a company that M1 was acquired by
SELECT count(*) WHERE {
?x0 a ns:business.employer .
?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M1 .
M2 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired ?x0 .
M3 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired ?x0
}