title: neo4j increment count when adding relationship
body: <p>The following Cypher query creates the <code>cnt</code> property and sets all to 0 when I run it the first time. The exact query run a second time updates the <code>cnt</code> property. Is it possible to increment node <code>cnt</code> for each relation that is added upon the load without running twice? </p>
  
  <pre><code>LOAD CSV WITH HEADERS FROM "file:///graph_data.csv" AS row
  MERGE (t1:Term {word:row.term1})
  MERGE (t2:Term {word:row.term2})
  WITH t1, t2, row
  MERGE (t1)-[:TOGETHER {id:row.id}]-(t2)
  ON MATCH SET
      t1.cnt = t1.cnt+1,
      t2.cnt = t2.cnt+1
  ON CREATE SET
      t1.cnt=0,
      t2.cnt=0
  RETURN t1,t2
  </code></pre>