question: Was M4 a company whose employee influenced M0 and influenced M1 , M2 , and M3
query: 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
  }