question: Were M2 , M5 , and M6 influenced by M3 , influenced by M4 , and influenced by a American editor of M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:people.person.nationality ns:m.09c7w0 .
  M2 ns:influence.influence_node.influenced_by ?x0 .
  M2 ns:influence.influence_node.influenced_by M3 .
  M2 ns:influence.influence_node.influenced_by M4 .
  M5 ns:influence.influence_node.influenced_by ?x0 .
  M5 ns:influence.influence_node.influenced_by M3 .
  M5 ns:influence.influence_node.influenced_by M4 .
  M6 ns:influence.influence_node.influenced_by ?x0 .
  M6 ns:influence.influence_node.influenced_by M3 .
  M6 ns:influence.influence_node.influenced_by M4
  }