title: Count number of rows with a column within another column
body: <p>Data:</p>
  
  <pre><code>col1 | col2
  -----------
  asd | bbbb
  as | asss
  abb | babb
  </code></pre>
  
  <p>col1 of row 2 and 3 appear in col2 so the answer should be 2.</p>