title: Find values on two colums on different sheets that don't match
body: <p>I have two worksheets, both have a column called part number. I need to find only the rows from both sheets that are unique. So if sheet one has:</p>
  
  <pre><code>part number
  ------------
  abc
  def
  ghi
  jkl
  </code></pre>
  
  <p>and sheet 2 has:</p>
  
  <pre><code>part number
  ------------
  abc
  def
  ghi
  zzz
  </code></pre>
  
  <p>I need the results to be: </p>
  
  <pre><code>jkl
  zzz
  </code></pre>