ass="language-dart">bool containsRectangle(Rectangle&lt;num&gt; another) {
  return left &lt;= another.left &amp;&amp;
      left + width &gt;= another.left + another.width &amp;&amp;
      top &lt;= another.top &amp;&amp;
      top + height &gt;= another.top + another.height;
}</code></pre>
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