span class="Operator">@</span><span class="Punctuation">[</span><span class="StringLit">&quot;1&quot;</span><span class="Operator">.</span><span class="Identifier">cstring</span><span class="Punctuation">,</span> <span class="StringLit">&quot;2&quot;</span><span class="Punctuation">,</span> <span class="StringLit">&quot;3&quot;</span><span class="Punctuation">]</span>
  <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">clear</span><span class="Punctuation">(</span><spa