question: Did a film editor that influenced M1 and was influenced by M3 influence M2
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  ?x0 ns:influence.influence_node.influenced M1 .
  ?x0 ns:influence.influence_node.influenced M2 .
  ?x0 ns:influence.influence_node.influenced_by M3
  }