title: Filter out elements in list of lists
body: <p>I want to filter out the number 2 in this list of lists:</p>
  
  <pre><code>myList = [[1,2,3],[1,2],[2,1,3,4]]
  </code></pre>
  
  <p>...so that when I use this length function:</p>
  
  <pre><code>noTwos xs = map length [x|x&lt;-xs]
  </code></pre>
  
  <p>I will get the result <code>[2,1,3]</code>.</p>
  
  <p>I tried with <code>[x|x&lt;-xs, x/=[2] ]</code> but that only filter out the list from <code>[2]</code> as elements,  how do I filter out the 2's in all the sublists?</p>