title: How can I create a hash of hashes in Perl?
body: <p>I am new to Perl. I need to define a data structure in Perl that looks like this:</p>
  
  <pre><code>  city 1 -&gt; street 1 - [ name , no of house , senior people ]
              street 2 - [ name , no of house , senior people ]
  
  
    city 2 -&gt; street 1 - [ name , no of house , senior people ]
              street 2 - [ name , no of house , senior people ]
  </code></pre>
  
  <p>How can I acheive this?</p>