title: Map with same key when fetched shows all related to that key
body: <p>I want to do something like this:</p>
  <pre><code>1 -&gt; imran
  2 -&gt; ajmal
  3 -&gt; habib
  4 -&gt; saurab
  4 -&gt; tendulkar
  </code></pre>
  <p>If I use <code>get(1)</code> I get</p>
  <p><code>imran</code></p>
  <p>Now if I use <code>get(4)</code> I should get</p>
  <pre><code>saurab
  tendulkar
  </code></pre>
  <p>Is this possible to do?</p>