问题: 给我找2条流入黄海的河流，发源都是哪里？
Cypher查询:
match (:ENTITY{name:'黄海'})<-[:Relationship*]-(m), (m)-[:Relationship{name:'发源'}]->(n) return m.name,n.name limit 2
查询结果:
m.name: 风河
n.name: 胶南市区以西铁橛山
m.name: 风河
n.name: 胶南市区以西铁橛山