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<p>Implement an algorithm to print all valid (e.g., properly opened and closed) combinations of n pairs of parentheses.</p>
<p>Note: The result set should not contain duplicated subsets.</p>
<p>For example, given&nbsp;n = 3, the result should be:</p>
<pre>
[
&quot;((()))&quot;,
&quot;(()())&quot;,
&quot;(())()&quot;,
&quot;()(())&quot;,
&quot;()()()&quot;
]
</pre>