title: Subtracting lines in one file from another file
body: <p>I couldn't find an answer that truly subtracts one file from another.</p>
  
  <p>My goal is to remove lines in one file that occur in another file.
  Multiple occurences should be respected, which means for exammple if one line occurs 4 times in file A and only once in file B, file C should have 3 of those lines.</p>
  
  <p>File A:</p>
  
  <pre><code>1
  3
  3
  3
  4
  4
  </code></pre>
  
  <p>File B:</p>
  
  <pre><code>1
  3
  4
  </code></pre>
  
  <p>File C (desired output)</p>
  
  <pre><code>3
  3
  4
  </code></pre>
  
  <p>Thanks in advance</p>