Was M4 a company whose employee influenced M0 and influenced M1 , M2 , and M3
SELECT count(*) WHERE {
?x0 ns:influence.influence_node.influenced M0 .
?x0 ns:influence.influence_node.influenced M1 .
?x0 ns:influence.influence_node.influenced M2 .
?x0 ns:influence.influence_node.influenced M3 .
M4 a ns:business.employer .
M4 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}