Finding unique rows of jagged array
<p>I have a jagged array of strings and I need to find all the rows which are unique. For e.g.,</p>

<pre><code>[ 
 ["A","B"] , 
 ["C","D","E"], 
 ["B", "A"],
 ["E","A"] 
]
</code></pre>

<p>This should return row 1 and row 3 as row 0 and row 2 are duplicates. How can this be done? Can I make use of hashets ?</p>
