Function to return distinct values in a 2D array
<p>I have the following 2D array</p>

<pre><code>var items = [['al','bv','sd'],
             ['al','cc','ab'],
             ['cv','vv','sw'],
             ['al','bv','sd']
            ];
</code></pre>

<p>I need a function which will return me a similar array but with distinct values. For example, in the above array, <code>['al','bv','sd']</code> happens twice.</p>

<p>I would like the function to return me:</p>

<pre><code>var items = [['al','bv','sd'],
             ['al','cc','ab'],
             ['cv','vv','sw']
            ];
</code></pre>
