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<p>有重复字符串的排列组合。编写一种方法,计算某字符串的所有排列组合。</p>
<p><strong>示例1:</strong></p>
<p><strong>示例 1</strong></p>
<pre><strong> 输入</strong>S = &quot;qqe&quot;
<strong></strong>[&quot;eqq&quot;,&quot;qeq&quot;,&quot;qqe&quot;]
<pre>
<strong></strong>S = "qqe"
<strong> 输出</strong>["eqq","qeq","qqe"]
</pre>
<p><strong>示例2:</strong></p>
<p><strong>示例 2</strong></p>
<pre><strong> 输入</strong>S = &quot;ab&quot;
<strong></strong>[&quot;ab&quot;, &quot;ba&quot;]
<pre>
<strong></strong>S = "ab"
<strong> 输出</strong>["ab", "ba"]
</pre>
<p><strong>提示:</strong></p>