Was a company that M2 , M3 , M4 , M5 , and M6 were employed by M0
SELECT count(*) WHERE {
M0 a ns:business.employer .
M0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
M0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
M0 ns:business.employer.employees/ns:business.employment_tenure.person M4 .
M0 ns:business.employer.employees/ns:business.employment_tenure.person M5 .
M0 ns:business.employer.employees/ns:business.employment_tenure.person M6
}