list reverse, list multiple by -1
<p>Expected Result:</p>

<pre><code>&gt;&gt;&gt; createLists(5)
([1, 2, 3, 4, 5], [5, 4, 3, 2, 1], [ -5, -4, -3, -2, -1], [-1, -2, -3, -4, -5])
</code></pre>

<p>My code:</p>

<pre><code>  # Write a function that returns 4 lists given a postive number.
    def createLists(num): 
        ls =    [item for item in range(num)]
        return set(ls, ls.reverse(), ls.reverse()*(-1), ls*(-1))
</code></pre>

<p>Anybody guide me how to do this?</p>

<p>thanks</p>
