title: Deleting full matched elements from a list
body: <p>I want to know if there is a possible way to erase a whole matched list from a big list in Python. For example,</p>
  
  <pre><code>a = ["2", "1", "2", "x"]
  </code></pre>
  
  <p>I want to know if there is a way to erase the <code>"2", "x"</code> from the list. Note, the position of the elements of the list is random but in any random position the <code>"2"</code> and <code>"x"</code> will be side by side i.e. after the <code>"2"</code> there will be <code>"x"</code>.</p>