Did M2 influence a screenwriter , influence M3 and M4 , and influence M1 's employee
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
M2 ns:influence.influence_node.influenced ?x0 .
M2 ns:influence.influence_node.influenced ?x1 .
M2 ns:influence.influence_node.influenced M3 .
M2 ns:influence.influence_node.influenced M4
}