how to do properly discard similar element from the list? : <p>I have list like this:</p>

<pre><code>a = [1,2,3,4,5,6,7]
b = [10,11,13,2,14,7]
</code></pre>

<p>I want output like this:</p>

<pre><code>b = [10,11,13,14]
</code></pre>

<p>if an element of a is in b then it has been discarded.
please, anyone can tell me how to do this?</p>
